| John P. Ryan | Frank Davies |
| Sharon Farrell | Lenore Davies |
| Andrew Duggan | The Professor |
| Guy Stockwell | Bob Clayton |
| James Dixon | Lieutenant Perkins |
| Michael Ansara | The Captain |
| Robert Emhardt | The Executive |
| William Wellman Jr. | Charley |
| Daniel Holzman | Chris Davies |
| Shamus Locke | The Doctor |
| Mary Nancy Burnett | Nurse |
| Diana Hale | Secretary (uncredited) |
| Patrick MacAllister | Expectant Father (uncredited) |
| Gerald York | Expectant Father (uncredited) |
| Jerry Taft | Expectant Father (uncredited) |
| Gwil Richards | Expectant Father (uncredited) |
| W. Allen York | Expectant Father (uncredited) |
Leaving their son, Chris, with a family friend, Frank and Lenore Davis head to the hospital for the birth of their second child -- which turns out to be a mutant who kills many doctors and nurses as it escapes. Convinced his monstrous son must be destroyed, Frank ignores Lenore and Chris' pleas and tries to destroy the freakish progeny, unaware that the infant may be the blameless product of an experimental drug gone wrong.
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