Spy Kids 2: The Island of Lost Dreams
In Spy Kids 2: The Island of Lost Dreams, Gary Giggles is first seen getting the transmooker from the president's daughter. Gary and Juni have a great deal of conflict between them because of Carmen's crush on Gary.
His father is an evil mastermind, and throughout the film, Juni warns Carmen about Gary because he has a sense that he is trouble. In the end, he turns out to be trouble, given that his father is a criminal.
At the end of the film, Gary tells Carmen that he might change his ways and switch over to the "good side" of espionage. However, when he walks away, his sunglasses read, "Bad Boy."
Spy Kids 3: Game Over
In Spy Kids 3-D: Game Over, he is seen for the last scene were Carmen calls him for help (while he was at an award ceremony that he had won spy of the year) when she almost gets eaten by one of the Toymaker's robots and assists the Carmen family and friends with his sister.