Debi Derryberry played the character of James 'Jimmy' Isaac Neutron (voice).
Megan Cavanagh played the character of Judy Neutron / VOX (voice).
Mark DeCarlo played the character of Hugh Neutron / Pilot / Arena Guard (voice).
Jeffrey Garcia played the character of Sheen Estevez (voice).
Patrick Stewart played the character of King Goobot V (voice).
Martin Short played the character of Ooblar (voice).
Frank Welker played the character of Goddard / Poultra (voice).
Rob Paulsen played the character of Carl Wheezer / Mr. and Mrs. Wheezer / Kid in Classroom (voice).
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