Prof. Erling and his financial backer Victor build a prototype time machine to snatch objects from the past. Latest find, a statuette, radiometrically dates to 5200 AD! When this draws colleague Richard Hedges to the island lab, Erling reveals that 20th-century objects put in the machine seem to be "traded" for analogous future objects by intelligent life. And on the sly, Victor's been trying to get a living visitor. Does the future need help, or is the present in danger?
| Editing | Dede Allen | Editor |
| Writing | Robert J. Gurney Jr. | Writer |
| Sound | Richard DuPage | Original Music Composer |
| Camera | Arthur Florman | Director of Photography |
| Directing | Robert J. Gurney Jr. | Director |
| Production | Robert J. Gurney Jr. | Producer |
| Art | Beatrice Guerney | Production Design |
| Production | James H. Nicholson | Executive Producer |
| Art | William Hoffman | Production Design |
| Production | Samuel Z. Arkoff | Executive Producer |
| Sound | Jack Shaindlin | Music |
| Production | Gene Searchinger | Associate Producer |
| Production | Beatrice Guerney | Production Supervisor |
| Sound | Emil Cadkin | Music |
| Sound | Paul Csonka | Music |
| Writing | Henry Slesar | Story |
| Costume & Make-Up | Rudolph Liszt | Makeup Artist |
| Sound | Robert Hathaway | Sound Engineer |
| Directing | Jack Dimond | Assistant Director |
