The Doctor attempts to test his new dematerialisation circuit by taking Jo to Metebelis Three but instead the TARDIS arrives in the hold of a 1920s cargo ship.
Quest roles:
Ian Marter(Harry Sullivan), Peter Halliday(Soldier), Michael Wisher(Magrik), Tenniel Evans(Major Daly), Jenny McCracken(Claire Daly), Leslie Dwyer(Vorg), Cheryl Hall(Shirna), Terence Lodge(Moss)