Legends of the Superheroes

• Adam West as Batman (both specials)
• Burt Ward as Robin (both specials)
• William Schallert as Retired Man/Scarlet Cyclone (both specials)
• Mickey Morton as Solomon Grundy (both specials)
• Jeff Altman as Weather Wizard (both specials)
• Charlie Callas as Sinestro (both specials)
• Howard Murphy as Green Lantern (both specials)
• Aleshia Brevard as Giganta (both specials)
• Garrett Craig as Captain Marvel (both specials)
• Howard Morris as Dr. Sivana (both specials)
• Danuta Wesley as Black Canary (both specials)
• Bill Nuckols as Hawkman (both specials)
• Rod Haase as The Flash (both specials)
• Gabriel Dell as Mordru (both specials)
• Barbara Joyce as Huntress (both specials)
• Frank Gorshin as The Riddler (1st special)
• Ruth Buzzi as Aunt Minerva (2nd special)
• Ed McMahon as Himself (2nd special)
• Alfie Wise as The Atom (2nd special)
• June Gable as Rhoda Rooter (2nd special)
• Pat Carroll as Hawkman's Mother (2nd special)
• Brad Sanders as Ghetto Man (2nd special)
• Gary Owens as Narrator (uncredited, both specials)
• Marsha Warfield as Woman in phone booth (uncredited, 1st special)

Notable guest stars in the two specials included Frank Gorshin reprising his role as The Riddler from Batman, Howard Morris as Doctor Sivana, Gabriel Dell as Mordru, Charlie Callas as Sinestro, Jeff Altman as the Weather Wizard, Ruth Buzzi as Aunt Minerva, June Gable as Rhoda Rooter, Pat Carroll as Hawkman's mother, Aleshia Brevard as Giganta, William Schallert playing the Scarlet Cyclone (more commonly referred to as "Retired Man") and Brad Sanders as "Ghetto Man". Ed McMahon played himself, hosting the celebrity super-hero roast.

In the first special, the Justice League of America (Batman, Robin, The Flash, Green Lantern, Hawkman, Captain Marvel, Huntress and Black Canary) unite at the Hall of Heroes to celebrate elderly retired superhero Scarlet Cyclone's birthday. The party is interrupted by the Legion of Doom (Riddler, Weather Wizard, Sinestro, Mordru, Doctor Sivana, Giganta and Solomon Grundy), who announce they have hidden a deadly bomb in a secret location, and the heroes must follow clues to find it. It's all actually a ruse to trick the heroes into drinking Dr. Sivana's de-powering potion. Despite the fact that they now lack their super-powers, the heroes fight the villains, and manage to both disarm the bomb and recover their powers. Only after the whole battle is over, and the heroes have proven victorious, does Scarlet Cyclone arrive to give his aid.

The second special is a celebrity roast of the superheroes hosted by Ed McMahon. All of the major characters from the first episode return, with the exception of the Riddler. New characters featured include Ghetto Man, an African-American superhero who performs a stand-up comedy routine; Aunt Minerva, the Captain Marvel villainess who seeks a sixth husband from among the male superheroes; Rhoda Rooter, an entertainment reporter who snags an exclusive interview with Giganta and The Atom (Alfie Wise) on their engagement to be married; and Esther Hol, Hawkman's mother.