Last updated 02 January 2017
Broadcast: Friday 15th April 2016
11:00pm-11:30pm EDT (03:00 GMT) « »
Featuring: Peter Davison, Janet Fielding, Mark Strickson, Tom Adams, Ingrid Pitt
Seabase 4 is on alert as a strange craft approaches. But the crew has been infiltrated by the enemy, so Commander Vorshak's solutions are scuppered at every turn.
Synopsis Source: Doctor Who Guide
Broadcast Source: Retro TV