A psychic's girlfriend finds out that a lump on her back is a growing reincarnation of a 400 year-old demonic Native American spirit.
| Actor | Role |
|---|---|
 Tony CurtisHarry Erskine | Harry Erskine |
 Michael AnsaraJohn Singing Rock | John Singing Rock |
 Susan StrasbergKaren Tandy | Karen Tandy |
 Stella StevensAmelia Crusoe | Amelia Crusoe |
 Jon CedarDr. Jack Hughes | Dr. Jack Hughes |
 Ann SothernMrs. Karmann | Mrs. Karmann |
 Burgess MeredithDr. Snow | Dr. Snow |
 Paul ManteeDr. McEvoy | Dr. McEvoy |
 Jeanette NolanMrs. Winconis | Mrs. Winconis |
 Lurene TuttleMrs. Herz | Mrs. Herz |
| HHugh CorcoranMacArthur | MacArthur |
| AAnne Newman Bacal10th-Floor Nurse | 10th-Floor Nurse |
| JJan HeiningerWolf, an orderly | Wolf, an orderly |
| MMichael LarenMichael, an orderly | Michael, an orderly |
| CCindy StanfordNeighbor | Neighbor |
 Felix SillaMisquamacus | Misquamacus |
 Charles KissingerAnesthesiologist | Anesthesiologist |