The central twist of "The Truman Show" is that Truman Burbank's entire life is a television show. His hometown of Seahaven is a giant, enclosed set, and everyone he knows is an actor. The film's plot follows his gradual realization of this truth. Key turning points include a falling stage light, his supposedly dead father reappearing as a homeless man before being whisked away, and a radio malfunction that broadcasts the crew's tracking of his movements.
His suspicion culminates in a desperate attempt to leave the island. He confronts his wife, Meryl, who breaks character under pressure, screaming for the director to intervene. His best friend, Marlon, is fed lines by the show's creator, Christof, to convince Truman he is being paranoid. Truman eventually overcomes his iatrogenic fear of water and sets sail in a small boat. In a dramatic climax, Christof creates a life-threatening storm to force him back, but Truman perseveres.
The film's ending reveals the physical limit of his world: his boat crashes into the painted sky wall of the dome. He discovers a staircase leading to an exit door. Christof speaks to him directly for the first time, a disembodied voice from the heavens, pleading with him to stay in the safe, perfect world he created for him. Truman, in a moment of quiet defiance, delivers his catchphrase—"In case I don't see ya, good afternoon, good evening, and good night!"—takes a bow, and steps through the door into the unknown real world. The final scene shows his former global audience, momentarily thrilled by his escape, immediately searching for something else to watch on TV, a final satirical jab at the audience's fickle nature and the disposability of media content.