Alicia Witt as Caitlin Fairchild (voice)

John de Lancie as Colonel John 'Jack' Lynch (voice)

E. G. Daily as Freefall / Roxy Spaulding (voice)

Flea as Grunge / Edward Chang (voice)

Mark Hamill as Threshold / Matthew Callahan (voice)

Lauren Lane as Ivana Baiul (voice)

Cloris Leachman as Helga (voice)

Corey Burton as Additional Voices (voice)

John DeMita as Additional Voices (voice)

Julia DeMita as Additional Voices (voice)

Debi Derryberry as Additional Voices (voice)

Dave Fennoy as Additional Voices (voice)

Alex Fernandez as Additional Voices (voice)

John Hostetter as Additional Voices (voice)

Matt McKenzie as Additional Voices (voice)

Matt K. Miller as Additional Voices (voice)

Andrew Philpot as Additional Voices (voice)

Pamela Adlon as Additional Voices (voice)

Michael Sorich as Additional Voices (voice)

Kath Soucie as Rachel (voice)

Ahmet Zappa as Additional Voices (voice)

Keith Ferguson as Additional Voices (voice; uncredited)

Jennifer Hale as Additional Voices (voice; uncredited)

Phil LaMarr as Additional Voices (voice; uncredited)

Ryan Ochoa as Additional Voices (voice; uncredited)