I'll be back

Variations of the line have been used by Schwarzenegger and other actors in each of the Terminator films.[2]

• The Terminator (1984) – "I'll be back". Said by the Terminator after being denied entry into a police station. The Terminator returns by driving a car through the front door and massacring the crew of the police station. Schwarzenegger has been quoted that he had not thought much about the line when filming the movie. Cameron notes in the DVD features that he expected the line to get a laugh only upon repeat viewings when what the character means is known, and he was surprised to see it get a big reaction from first-time audiences, who had quickly come to understand the character and immediately anticipated the outrageous violence the nonchalant line signifies. In the novelization of the film script, The Terminator by Shaun Hutson the Terminator says "I'll come back," rather than "I'll be back," on p. 117. ISBN 0-352-31645-4.
• Terminator 2: Judgment Day (1991) – "Stay here, I'll be back." (1:53:47) It is said by the Terminator to Sarah and John Connor during the escape from the Cyberdyne building. The character returns by driving a truck through the front door to rescue the human protagonists trapped inside, referencing the corresponding scene in the first movie. A fitness ad on the initial VHS releases ends with Schwarzenegger telling viewers, "And if you're still not convinced, I'll be back."
• Terminator 3: Rise of the Machines (2003) – "She'll be back" is said by the Terminator in reference to the enemy T-X android. It says "I'm back!" after it flies a helicopter into the antechamber of a military bunker and emerges from the wreckage. In the latter use, the phrase "I'm back" also refers to his return to loyalty and allegiance with the protagonists, after having been "corrupted" by the villainous T-X. Schwarzenegger also uses it in the DVD introduction.
• Terminator Salvation (2009) – "I'll be back" is said by John Connor after being asked by his wife Kate Brewster, "What should I tell your men when they find out you're gone?". Another line, "We knew, you'll be back" is said by Skynet in a monitor under the guise of the late Dr. Serena Kogan, after Marcus Wright recovers himself at Skynet Central.
• Terminator Genisys (2015) – "I'll be back" is said by the Guardian right before jumping out of a helicopter onto another pursuing helicopter. Also "I'll go back" is said by Kyle Reese as he volunteers for teleporting back to 1984.
• Terminator: Dark Fate (2019) – "I'll be back" is said by Sarah Connor after she throws a grenade from a bridge at the exoskeleton of the Rev-9 prototype, before marching off with a shotgun, intending on destroying the Terminator.[3][4] Carl, the T-800 that killed John Connor, tells its human family "I won't be back" before leaving with Sarah, Grace and Dani.

Schwarzenegger has uttered the phrase in other films following The Terminator, including:

• Commando (1985): John Matrix (Schwarzenegger) says, "I'll be back, Bennett" in a scene wherein Bennett, Cooke, Sully, and Henriques take him to the airport.
• The Running Man (1987): Benjamin Richards (Schwarzenegger) says, "I'll be back!"
• Twins (1988): Julius Benedict (Schwarzenegger) says, "If you're lying to me, I'll be back" in a scene in the Los Alamos lab.
• Total Recall (1990): Douglas Quaid (Schwarzenegger) says, "I'll be back."
• Last Action Hero (1993): Jack Slater (Schwarzenegger) says, "I'll be back!"
• The Expendables 2 (2012): During a gunfight in an airport, Trench (Schwarzenegger) says, "I'm almost out, I'll be back!" To this, Church (Bruce Willis) replies, "You've been back enough. I'll be back."