After successfully curing a primate's heart condition, Dr. Henry Jeckyll develops a personality-enhancing serum for himself which inadvertently creates an evil alter ego personality, Edward Hyde, who sets out to terrorize college co-eds.

Tony Todd
as Dr. Henry Jekyll / Edward Hyde

Tracy Scoggins
as Karen Utterson

Vernon Wells
as Dr. Dennis Lanyon

Danielle Nicolet
as Whitney Weddings

Stephen Wastell
as Detective Richard Enfield

Deborah Shelton
as Donna Carew

Judi Shekoni
as Renee

Tim Thomerson
as Arnie Swift

Peter Jason
as Lt. Hamilton

Peter Lupus III
as Gerald Poole