The Doctor joins forces with his oldest companion on record when a military base comes under attack from sentient, dangerous waters. It may be another stand against immeasurable odds, but waiting in the wings for the Time Lord is a sign all songs must end....
| Creator | Sydney Newman |
|---|---|
| Actor | Jodie Whittaker, Mandip Gill, John Bishop |
| Country | Canada, United Kingdom |
| Production | BBC Cymru Wales |