Episode 5 of The Sea Devils, the latest in BBC Two’s ongoing repeat season, will air tonight.

The Radio Times says:

“Six-part sci-fi adventure. Starring Jon Pertwee. 5: The Doctor is held prisoner. Written by Malcolm Hulke Producer Barry Letts. Director Michael Briant . TELETEXT SUBTITLES: page 888”

The Sea Devils Episode 5 airs tonight on BBC Two at 6:20pm.