Omega reveals the purpose behind bringing the Doctor to his antimatter world, but the Doctor(s) discover a startling fact about Omega that he didn't know himself and eventually strike a bargain.
| Name | Type | Role | |
|---|---|---|---|
| Bob Baker, Dave Martin | Writer | ||
| Patricia Prior | Guest Star | ||
| Laurie Webb | Guest Star | ||
| Roy Purcell | Guest Star | President of the Council | |
| Lennie Mayne | Director |