Creature of Destruction

A suave, silver-haired stage hypnotist who proclaims clairvoyance and expertise in reincarnation. He uses hypnotic regression to pull Doreena into a prehistoric past and to conjure the Gill Monster for his own theatrical and financial gain. His arrogance and hunger for notoriety drive the killings, and he believes the monsters still lurk within everyone.

An Air Force psychologist and rational investigator who becomes drawn to Doreena and the case. He embodies scientific skepticism tempered by curiosity about paranormal phenomena. He fights to free Doreena from Basso's mental domination and prevent further violence.

Beautiful assistant and unwilling test subject for Basso's experiments. Entranced, she becomes the conduit through which the past-life Gill Monster is summoned. As she regains agency, she wavers between fear and resilience under Basso's manipulation.

Fiancée of Sam Crane and guest at the party, she drags Ted into the social world where Basso performs. She represents the glamorous socialite milieu that helps propel the events and mingles with wealth and influence.

Retired business tycoon and wealthy host who sees Basso's abilities as another opportunity to profit. He is cynical about the paranormal claims and looks for a way to monetize the danger for a sensational show.

Detective who suspects Basso's guilt and leads the investigation, persistent but initially unable to stop the killings. His role adds a procedural counterweight to the occult drama.

A prehistoric, amphibious predator that is conjured from Doreena's mind and unleashed by Basso. The creature is nearly indestructible, tearing through the scene with a haunting, otherworldly presence before the fatal culmination.

A psychiatrist involved in examining the case and the paranormal claims; he offers clinical commentary on Basso's methods and the mental state of Doreena and the victims.