Young Sheldon

• Iain Armitage as Sheldon Cooper, a child prodigy well-versed in various branches of mathematics and science. He states that he decided to pursue physics around the same time as the show began. While academically gifted, Sheldon sometimes lacks a full understanding of social cues, in addition to having a sense of superiority over everyone around him. Nevertheless, Sheldon has proven to love his family and almost always has his heart in the right place.[2][6] He is Georgie's younger brother and Missy’s fraternal older twin brother. He is age 9 in the first season and age 12 by the fifth.
  • Jim Parsons is the voice of adult Sheldon Cooper, who provides the perspective of an adult recalling his childhood.[1]
• Zoe Perry as Mary Cooper (née Tucker), mother of Sheldon, Missy, and Georgie. She is very protective and patient with Sheldon, but also struggles to understand him at times. She is a devout Southern Baptist, working at her local church, and sometimes objects to Sheldon's atheism. Nevertheless, she deeply loves her son and wants to protect him for as long as she can.[6] Perry's mother, Laurie Metcalf, played Mary on The Big Bang Theory.
• Lance Barber as George Cooper Sr., Sheldon, Missy, and Georgie's father; a Vietnam veteran; and the former head football coach at Medford High. George does not share Sheldon's intellect, which sometimes leads others, especially Meemaw, to doubt his genetic relationship to Sheldon. He is often at odds with his children and particularly struggles to understand Sheldon, but he does try to be a caring and responsible father. In The Big Bang Theory, it is stated that George Cooper Sr. will pass away when Sheldon is 14 years old in 1995. Barber appeared in a Season 5 episode of The Big Bang Theory as one of Leonard's high school bullies, Jimmy Speckerman, before making an appearance via a '90s videotape as his Young Sheldon character in a final season episode.
• Montana Jordan as George "Georgie" Cooper Jr., Sheldon and Missy's older brother. Georgie resents the attention his parents pay to Sheldon. He does not do well at school and gets mocked and teased for it by the rest of the family, particularly Sheldon and Meemaw. He does not get along with his brother Sheldon because he's tired of always being compared to his brother. He attends Medford High with Sheldon and plays on the school's football team.[1][2] At age 17, he drops out of school to work full-time and discovers a talent for sales that will lead him to become the wealthy owner of a tire store chain in The Big Bang Theory, on which he is played by Jerry O'Connell.
• Raegan Revord as Melissa "Missy" Cooper, Georgie's younger sister and Sheldon's fraternal younger twin sister. She teases Sheldon along with Georgie but not as much. She does not share Sheldon's intelligence, but is very perceptive. Occasionally, she does not get along with Sheldon, but she finds in her twin brother a solid confidant and has admitted to not feeling as whole without him. She also shows love for her brother even though she constantly denies it.[1] Courtney Henggeler plays adult Missy in The Big Bang Theory.
• Annie Potts as Constance "Connie" Tucker, Sheldon, Missy, and Georgie's maternal grandmother, whom they refer to as "Meemaw". She is a fun-loving woman who can be sarcastic and often mocks those around her, especially George. On the other hand, she is patient with Sheldon and sometimes struggles to understand him, whom she affectionately calls 'Moonpie', and advises Mary to trust that Sheldon will find his way.[7] In the fourth season, she was said to be 68 years old. June Squibb plays old Constance in The Big Bang Theory.
• Matt Hobby as Pastor Jeff Difford (season 3–present; recurring seasons 1–2), the upbeat pastor at the Cooper family's Baptist church. Like Mary, he too sometimes has friction with Sheldon's irreligious side and often challenges Sheldon to explore their line of thought through logic exercises.
• Wyatt McClure as Billy Sparks (season 5–present; recurring seasons 1–4), the son of Herschel and Brenda, whom his mother implies is in no danger of going to college. He was originally portrayed as Sheldon's nemesis, but becomes much friendlier early in the series. He has an unrequited crush on Missy.
• Emily Osment as Mandy McAllister (season 6;[8] recurring season 5), Georgie's 29-year-old girlfriend, whom he gets pregnant

• Wallace Shawn as John Sturgis (season 1–present), a college physics professor whose class Sheldon attends as his first college course. He dates Meemaw with Sheldon's encouragement in seasons 1 through 3. He also works for a grocery store from later season 4 to early season 5 after being fired from working on a hadron super collider, before getting fired again.
• Ryan Phuong as Tam Nguyen (season 1–4), Sheldon's Vietnamese-American childhood best friend and classmate. Tam is responsible for introducing Sheldon to many of his non-scientific interests, including comic books and role-playing games. Tam is Sheldon's only friend who consistently puts up with him. Robert Wu plays adult Tam on The Big Bang Theory.
• Billy Gardell as Herschel Sparks (seasons 1–2), Billy's father and Brenda's husband, who owns a garage and divorces his wife in season 4
• Melissa Peterman as Brenda Sparks (season 1–present), Billy's mother, Herschel's wife until season 4, and Mary's initial nemesis and eventual friend, who works at the bowling alley frequented by Meemaw
• Doc Farrow as Assistant Coach Wayne Wilkins (season 1–present), Sheldon's P.E. teacher and the former assistant, now head football coach at Medford High. He was originally given the name Roy, but it was changed to Wayne as of the episode "A Broom Closet and Satan's Monopoly Board".
• Valerie Mahaffey as Victoria MacElroy (seasons 1–3), Sheldon's homeroom and English teacher at Medford High
• Danielle Pinnock as Evelyn Ingram (seasons 1–4), Sheldon's math teacher at Medford High.
• Brian Stepanek as Hubert Givens (season 1–present), Sheldon's science teacher at Medford High
• Rex Linn as Tom Petersen (season 1–present), the principal of Medford High
• Sarah Baker as Sheryl Hutchins (season 1–present), the Medford High librarian
• Jason Alexander as Gene Lundy (season 1–present), Medford High School's resident drama teacher
• Nancy Linehan Charles as Peg (season 1–present), Pastor Jeff's chain-smoking secretary
• Chris Wylde as Glenn (seasons 1–3), the owner of the comic book store King Kong Comics
• Isabel May as Veronica Duncan (seasons 2–3), Georgie's Halloween date who is introduced in "Seven Deadly Sins and a Small Carl Sagan". She becomes a Christian after witnessing the "lust" room in Mr. Lundy's haunted house and loses interest in Georgie, who continues trying to win her over. She starts liking Georgie but backs off after he starts dating Jana.
• Ed Begley Jr. as Dr. Grant Linkletter (season 2–present), a colleague of Dr. Sturgis. He regularly pursues Connie but is continually rebuffed.
• Mckenna Grace as Paige Swanson (season 2–present), a child prodigy whom Sheldon views as his rival.
• Andrea Anders as Linda Swanson (seasons 2–4), Paige's mother
• Mary Grill as Officer Robin (seasons 2–3), Pastor Jeff's second wife who works as a police officer
• Craig T. Nelson as Dale Ballard (season 3–present), Missy's baseball coach and Meemaw's new boyfriend after Dr. Sturgis breaks up with her;[9] he owns a sporting goods store and hires Georgie and George to work there.
• Reba McEntire as June (season 3–present), Dale's ex-wife, the local hairdresser whom Meemaw befriends.
• Ava Allan as Jana Boggs (season 3–5), Georgie's girlfriend after he gives up pursuing Veronica, but she breaks up with him in season 5 since she is upset that he decided to drop out of school
• London Cheshire as Marcus Larson (seasons 3–4), Missy's boyfriend
• Wendie Malick as President Linda Hagemeyer (season 4–present), the president of Sheldon's university
• Dan Byrd as Pastor Rob (season 5), a young, unorthodox pastor hired by Pastor Jeff to teach Sunday school. He and Mary appear to become mutually interested in one another during the fifth season, which upsets George.
• Caleb Emery as Darren (season 5), one of Sheldon's new college dorm room neighbors
• Ivan Mok as Oscar (season 5), one of Sheldon's new college dorm room neighbors
• Rachel Bay Jones as Audrey McCallister (season 6), Mandy's mother[10]
• Will Sasso as Jim McCallister (season 6), Mandy's father[10]

• Melissa Tang as Ms. Fenley, a music teacher at Sheldon's high school. Tang had previously played the character Mandy Chao in an episode of The Big Bang Theory.
• Vernee Watson as Nurse Althea Robinson, a nurse who caters to George when he suffers a mild heart attack and then to Sheldon when he has his gall bladder removed. Watson also plays a nurse named Althea in numerous episodes of The Big Bang Theory, including its pilot.
• John Hartman as Dr. Goetsch, the psychiatrist Sheldon sees when he has Phagophobia and when he loses at the Medford High science fair.
• Ray Liotta as Vincent, Meemaw's bookie.
• Jason Kravits as Dr. Ronald Hodges, a NASA engineer and college roommate of Mr. Givens. He makes a presentation about his work to Mr. Givens' science class, which intrigues Sheldon to solve the challenges of reusable launch systems.
• Elon Musk makes a cameo appearance in the episode "A Patch, a Modem, and a Zantac®" in a flashforward scene set 27 years into the future.
• Dave Florek as Dr. Eberland, Sheldon's doctor.
• Karly Rothenberg as Mrs. Janice Veazey, Dr. Hodges' secretary.
• Frances Conroy as Dr. Flora Douglas, headmaster of the boarding school Sheldon briefly attends.
• Harry Groener as Elliot Douglas, Dr. Douglas' husband.
• Paul Yen as Le Nguyen, Tam's father. He runs Medford Mart with his wife.
• VyVy Nguyen as Trang Nguyen, Tam's mother and Mr. Nguyen's wife.
• Phil Morris as the voice of One and Anjali Bhimani as the voice of Zero in a dream Sheldon has.
• Richard Kind as Ira Rosenbloom, one of Meemaw's boyfriends.
• Zuleyka Silver as Selena, Pastor Jeff's ex-wife
• Anjelika Washington as Libby, an eleventh grade student who aspires to be a geologist and whom Sheldon and Tam befriend.
• Ella and Mia Allan as Bobbi Sparks, Billy Sparks' younger sister with a reputation for tormenting Sheldon.
• Cleo King as Mrs. Costello, a Medford High School counselor
• Michael Cudlitz as a NASA supervisor who appears in Sheldon's daydream sequence.
• Josh Cooke as Barry Swanson, Paige's father.
• Ella Anderson as Erica, Paige's sister, who bonds with Georgie and Missy because they share common experiences being siblings of child prodigies
• Paul Fusco appears as ALF in "A Race of Superhumans and a Letter to Alf" when he reads Missy's letter.[11]
• Mauricio Lara as Ricky, Sheldon's hospital roommate in "A Tummy Ache and a Whale of a Metaphor"
• John Rubinstein as Rabbi Schneiderman
• Benjamin Stockham as Preston
• Maree Cheatham as Dorothy, Veronica's grandmother.
• Diedrich Bader as the voice of Batman in one of Sheldon's daydreams.
• Steve Burns as Nathan. Burns also is the performer of the show’s theme song.
• Taylor Spreitler as Sam, a member of Sheldon's project group.
• Nolan Bateman as Keith, a member of Sheldon's project group.
• Louie Anderson as Ralph, the owner of a trophy shop where Mary wants to buy one for Missy.
• Ryan Stiles as Dr. Bowers, Sheldon's dentist.
• Melanie Lynskey as Professor Dora Ericson, Sheldon's college philosophy professor
• Dave Foley as Gary, Sheldon's university benefactor
• David Hasselhoff as himself
• Julia Pace Mitchell as Darlene Wilkins, Coach Wilkins' wife
• Diane Ladd, Alan Rachins and Marla Gibbs as Hortense, Vern and Doris, Meemaw's friends.
• Bill Fagerbakke as Jake, a police officer and Dale Ballard's acquaintance.
• Lance Reddick as Professor Boucher, a former Army engineer and a professor of engineering at Sheldon’s university.
• Stephen Hawking as himself (voice-only).
• Ming-Na Wen as Dr. Carol Lee, a physicist from UC Berkeley brought in to lead a project that Sheldon, Dr. Sturgis, and Dr. Linkletter are working on.
• Penn Jillette and Teller as Pimple and Pus, Sheldon's imaginary personifications of his first pimple and its pus, who appear when he begins going through puberty.

Original cast cameos

• Mayim Bialik as Amy Farrah Fowler, Sheldon's wife and the mother of his son, Leonard Cooper, as well as at least one other child. This role is reprised from The Big Bang Theory. She appears as part of the narration.
• Kaley Cuoco as the voice of the pool water in one of Sheldon's nightmares. Cuoco previously played Penny in The Big Bang Theory.[12]
• Simon Helberg as Howard Wolowitz, an aeronautical engineer and one of Sheldon’s adulthood friends. This role is reprised from The Big Bang Theory. He appears as part of the narration.
• Bob Newhart as Arthur Jeffries, a scientist who plays the title character of Professor Proton, Sheldon's favorite educational television series. The character is an homage to Mr. Wizard.[13] Newhart reprises his portrayal of the character from The Big Bang Theory.

In November 2016, it was reported that CBS was in negotiations to create a spin-off of The Big Bang Theory centered on Sheldon Cooper as a young boy. The prequel series, described as "a Malcolm in the Middle-esque single-camera family comedy" would be executive produced by The Big Bang Theory co-creator Chuck Lorre and producer Steven Molaro, with The Big Bang Theory co-creator Bill Prady expected to be involved in some capacity, and intended to air in the 2017–18 season alongside The Big Bang Theory.[19][20] The initial idea for the series came from Jim Parsons (who portrays the older Sheldon on The Big Bang Theory), who passed it along to The Big Bang Theory producers.[6] On March 13, 2017, CBS ordered the spin-off Young Sheldon series, which was created by Lorre and Molaro. Jon Favreau directed and executive produced the pilot. Parsons, Lorre, Molaro and Todd Spiewak also serve as executive producers on the series, for Chuck Lorre Productions and Warner Bros. Television.[1] On September 27, 2017, CBS picked up the series for a full season of 22 episodes.[21] On January 6, 2018, the show was renewed for a second season, which premiered on September 24 of that same year.[22][23]

On February 22, 2019, CBS renewed the series for both a third and a fourth season.[24] The third season premiered on September 26, 2019.[25] Warner Bros. Television suspended production on March 13, 2020, due to the COVID-19 pandemic, leaving the third season with only 21 episodes.[26] Production for the fourth season began on September 22, 2020, but was paused on October 9, 2020, for one month, due to a positive COVID-19 test.[27] The fourth season premiered on November 5, 2020.[28]

Production for the fourth season concluded on March 15, 2021.[29]

On March 30, 2021, CBS renewed the series for a fifth, sixth, and seventh season.[30] The fifth season premiered on October 7, 2021.[31] The sixth season premiered on September 29, 2022.[32]

In early March 2017, Iain Armitage was cast as the younger Sheldon, as well as Zoe Perry as his mother, Mary Cooper. Perry is the real-life daughter of Laurie Metcalf, who portrays Mary Cooper on The Big Bang Theory.[6] Lance Barber stars as George Cooper Sr., Sheldon's father; he had previously appeared in one episode of The Big Bang Theory.[33] Raegan Revord stars as Missy Cooper, Sheldon's twin sister; Revord got the part only after repeatedly asking her mother to be allowed to read for the role.[34] The show also stars Montana Jordan as George Cooper Jr., Sheldon's older brother. Jim Parsons reprises his role as adult Sheldon Cooper, as narrator for the series.[2] In July 2017, Annie Potts was cast as Meemaw, Sheldon's grandmother.[7]

In most cases different actors are used to portray a given character in the two series, to account for the age difference. Jim Parsons is a notable exception in that he appears in both series as the same character, though in this series his appearance is limited to voice only. In the Season 4 episode "Graduation", Mayim Bialik (as Amy, the wife of adult Sheldon) has a brief voice-over role while Sheldon describes the graduation party for their son Leonard, whom he reveals was named after Leonard Hofstadter and Leonard Nimoy. Bob Newhart appears as Professor Proton in both series; with the appearance in this series, the character is made to look younger. Iain Armitage (Sheldon), Lance Barber (George), and Montana Jordan (Georgie) make a guest appearance in the parent series in a scene in which a VHS tape recorded decades earlier is played.[35] There are other actors who appear in both series but as different characters. This includes Barber, who had another guest appearance in the parent series as a different character, and Kaley Cuoco who stars in the parent series and makes an uncredited voice appearance in this series, voicing an inanimate object.[36][12] Elon Musk makes cameo appearances as himself in both series.[37][38]

The second-season finale episode aired immediately following the one-hour series finale of the parent series. In a tribute to the parent series finale, several references are made to it in the Young Sheldon episode. The references are both general to the entire parent series, as well as to the series finale in particular. In one scene in the Young Sheldon episode, Sheldon promises his father that when he wins the Nobel Prize, Sheldon will mention him in his acceptance speech. In the parent series finale, Sheldon wins the Nobel Prize, and he does mention his father (amongst others) in the acceptance speech. In another scene in the Young Sheldon episode, Nobel Prize winners are announced out over a montage showing the main characters from the parent series Leonard, Penny, Raj, Howard, Bernadette, and Amy as children. Christine Baranski and Carol Ann Susi, who respectively portray Leonard's mother and Howard's mother in the parent series, make a voice appearance in the montage (a posthumous appearance in the case of Susi). Following the montage, adult Sheldon says that he was wrong about feeling at the moment of the Nobel prize announcement that he would be all alone for the rest of his life.[39]

Young Sheldon began airing weekly episodes on CBS on November 2, 2017, after The Big Bang Theory. It premiered as a special preview on September 25, 2017.[2]

Young Sheldon entered off-network syndication on Nick at Nite as of November 30, 2020.[42][43]

In the United Kingdom, Young Sheldon is aired on the free-to-air channel E4, with season 1 premiered on February 22, 2018.[44] Subsequent seasons premiered on November 8, 2018, and October 10, 2019, for seasons 2 and 3 respectively.[44] Season 4 of Young Sheldon premiered on October 20, 2021, on E4 at 9 pm [45] Season 5 of Young Sheldon premiered on April 24, 2022 at 8pm on E4.[46] On September 27, 2021, the series entered syndication in local markets, covering roughly 90% of the United States.[47] The series also entered off-network syndication on TBS and began airing on September 27, 2021.[48]

In May 2020, it was announced that the first three seasons of the series would stream on the WarnerMedia-owned HBO Max service; no release date was announced at that time.[49] The first three seasons were added on September 2, 2020.[50] The fifth season debuted on September 7, 2022.

In October and November 2021, Netflix in Australia and the United Kingdom picked up the streaming rights to the show.[51]

For the first season, the review aggregator website Rotten Tomatoes reported a 76% approval rating with an average rating of 6.6/10 based on 46 reviews. The website's consensus reads, "Young Sheldon's appealing cast and relatable themes bring a fresh—and overall enjoyable—perspective to its central character's familiar story."[65] Metacritic, which uses a weighted average, assigned a score of 63 out of 100 based on 25 critics, indicating "generally favorable reviews".[66]