| Story: | 143 | Writer: | John S. Drew |
| Code: | 8D | Production details: | 1997 Everlasting Films |
| Number: | 19D8 | Duration: | 85 minutes |
| Trailer | 1 | 2 | 3 | 4 | 5 |
| Available | |
| Unavailable |
| Doctor Who | - | Jeffrey Coburn | (all) |
| Dara Hamilton | - | Sheri Devine | (all) |
| Commander Marin | - | Chip Jamison | (all) |
| Hawk | - | Jym De Natale | (all) |
| Lucky | - | Jay Smith | (1, 3-5) |
| Logan | - | Donna Coker | (1) |
| Script Editor | Joe Medina |
| Title Music | Dominic Glynn |
| Graphics | Chris Sutor |
| Story by | John S. Drew |
| Special Sounds | Rachel Sommers |
| Title Sequence by | Everlasting Films |
| Sid Sutton | |
| Bernard Lodge | |
| Produced by | Douglas Phillips |
| Executive producer | Richard Segal |
| Directed by | Thomas Himinez |
The Doomsday Signal came about when I was watching the end of Logopolis. The Master is on top of the tower, transmitting his signal. The Doctor stops him, but the signal does get out, even for a moment. I wondered what would happen if somebody actually picked up that signal. "This piddling little planet dares to challenge us?!? Let's destroy them!" I didn't originally intend for the story to be so comical, though it does have a great about of drama in it. But as I was developing it, I thought, "wouldn't it be funny if more kept showing up?" I feel that some of the best voice work was done in this particular episode.
- John S. Drew