Earth's ocean floor, 2084. With two superpowers poised on the brink of a devastating photonic war, a missile base comes under attack from the reptilian Sea Devils and Silurians, intent on eradicating the upstart human race and reclaiming the planet...
| Name | Type | Role | |
|---|---|---|---|
| Johnny Byrne | Writer | ||
| Vincent Brimble | Guest Star | ||
| Norman Comer | Guest Star | ||
| Christopher Farries | Guest Star | ||
| Tom Adams | Guest Star | ||
| Nigel Humphreys | Guest Star | ||
| Tara Ward | Guest Star | ||
| Pennant Roberts | Director |