Brianne Siddall
Thunder / Dylan (voice)
Shanelle Gray
Maggie (voice)
Robin Atkin Downes
Jack / Carlo (voice)
Doug Stone
Mr. Lawrence (voice)
Grant George
Daniel (voice)
Joey Camen
Chihuahua (voice)
Elisa Gabrielli
Carla (voice)
Cinda Adams
Nurse Baxter (voice)
Sage Sommer
Izzy (voice)
Kyle Hebert
Mark Matthews (voice)
Bill Parks
Mike Matthews (voice)
Ella Rouhier
Hospital children (voice)
Noah Ray Strauss
Hospital children (voice)
Isabella Tatone
Hospital children (voice)
Keegan Thomas
Hospital children (voice)
Jim Ward
Reggie (voice)
Susanne Blakeslee
Audrey (voice)
Roxanne Reese
Lasondra (voice)
Joe Ochman
Mr. Eames (voice)
Grey DeLisle
Mrs. Eames (voice)
Lani Minella
Old Lady (voice)
Frank Welker
Cat sounds (archive footage; uncredited)