Marshmen invade the Terradonian ship thanks to Romana, who seems to be in communion with them. While the ship's inhabitants flee for their lives, the Doctor discovers a crucial fact why these humanoids can never return to the planet Terradon.
Quest roles:
Matthew Waterhouse(Adric), Alan Rowe(Garif), June Page(Keara), James Bree(Nefred), George Baker(Login)