Star Kid

Spencer Griffith

Roland Griffith

Cyborsuit

Manfred 'Turbo' Bruntley

Broodwarrior

Stacey Griffith

Hank Bruntley

Cyborsuit (voice)

Kevin, Stacey's Boyfriend

Michelle Eberhardt

Nadia

Mika

Burgerworld Girl

Officer #1

Rookie Cop

Trelkin / 'Nath'

Trelkin / 'Tenris'

Trelkin

Trelkin (as Terry Castillo-Faass)

Mom (uncredited)

Hall Monitor (uncredited)

The science class's pet tarantula is named "Leo G.", a reference to Leo G. Carroll, star of Tarantula (1955). (Also, the school is called Waverly, which was Carroll's character's name in "The Man From U.N.C.L.E".)

After the movie's cinematic debut, Joseph Mazzello was asked in a magazine interview how he liked the role, with the interviewer assuming playing a kid in an exo-suit must have been exciting. Joseph replied it wasn't very much fun, since a stuntman did all of the exterior shots of the Cyborsuit and all he got to do for the reaction shots was sit on a stool in front of a screen.

The dirt on Spencer's clothing after coming out of a garbage can changes when it switches to him entering the car.

When Spencer tells a joke to the robot, he says, "What do you call a cow with no feet? Ground beef." Which makes no sense. But later when the robot repeats part of the joke back to Spencer on entering his room for the first time, the robot says, "A cow with no legs." Which makes sense. So Spencer clearly mis-told the joke at first and it was just never corrected.

Spencer Griffith: [wondering how he can eat a burger whilst trapped in the Cyborsuit] How am I supposed to eat this thing?