A father who experiments with his son's psychokinetic powers is unaware that these experiments have released a demon from hell which lives in his son's closet, preparing to take over the young boy's soul.
| Actor | Role |
|---|---|
 Cotter SmithSergeant Sam Taliaferro | Sergeant Sam Taliaferro |
 Mel HarrisDr. Nora Haley | Dr. Nora Haley |
 Scott CurtisCameron Lansing | Cameron Lansing |
 Chuck McCannBen Majors | Ben Majors |
 Leigh McCloskeyPete Groom | Pete Groom |
 Kim LankfordDory Lansing | Dory Lansing |
 Gary HudsonBob Froelich | Bob Froelich |
 Tab HunterOwen Lansing | Owen Lansing |
 Dort ClarkAlan Wilson | Alan Wilson |
 David PovallCapt. Navarro | Capt. Navarro |
| WWilson SmithJoe Crespy | Joe Crespy |
| KKerry Yo NakagawaPoliceman | Policeman |
| RRaymond PattersonPhysician | Physician |
| SSkip E. LoweNewscaster | Newscaster |
| BBonnie BradiganNewswoman | Newswoman |
 Frank PesceEd Wallace | Ed Wallace |
| PPaul W. ZecevicReporter | Reporter |
| DDoc D. CharbonneauLittle Demon | Little Demon |
 William LustigIce Cream Eater (uncredited) | Ice Cream Eater (uncredited) |