Jerry O'Connell as Quinn Michael "Q-Ball" Mallory
Sabrina Lloyd as Wade Kathleen Wells
Kari Wuhrer as Margaret "Maggie" Allison Beckett
Cleavant Derricks as Rembrandt Lee "Crying Man" Brown
John Rhys-Davies as Professor Maximillian P. Arturo
Tembi Locke as Dr. Diana Davis
Charlie O'Connell as Colin Mallory
Robert Floyd as Quinn "Mallory" Mallory