Sarah and David Kirsten are tourists from the 21st century who take a forbidden holiday in 1938 Mexico. But enforcers from the future, trying to keep the time-stream free from pollution and paradox, are on their trail. Can they evade their pursuers without betraying their origins?
| Actor | Role |
|---|---|
| FFrederick BartmanBill Travis / David Kirsten | Bill Travis / David Kirsten |
| LLiane AukinSusan Travis / Sarah Kirsten | Susan Travis / Sarah Kirsten |
 Warren MitchellJoe | Joe |
 Marne MaitlandShaw | Shaw |
 Eric FlynnFaber | Faber |
| MMarcella MarkhamBeth | Beth |
| DDelphineDancer | Dancer |