Kyle Breitkopf

as Teenage Gregory / Scarecrow

as Arvin

as Desmond Swann (10 episodes)

as Jude Andrews

as Rusty Rivets (voice)

as Andrew

as Miles

as Ace (2 episodes)

as Rusty Rivets (voice) (150 episodes)

as Gekko (voice) (20 episodes)

as Greg/Gekko/Baby Gekko (voice) (156 episodes)

as Henry Bennigan (13 episodes)

as O'Brien (1 episode)

as Jackson Marshall

as Barker Simmons

as Mikey Patterson (as Kyle Harrison Breitkopf) (1 episode)

as Isaac Waite (as Kyle Harrison Breitkopf) (4 episodes), as Isaac Waite (uncredited) (2 episodes)

as Nathan Cross (1 episode)