Release Message:  A time corridor forces the Doctor (Peter Davison) to the London docklands on present-day Earth where a bomb squad watches over some strange, alien canisters.

Description:  A time corridor forces the Doctor to the London docklands on present-day Earth where a bomb squad watches over some strange, alien canisters. At the other end, a battle cruiser lunches an assault on a prison space station that holds just one prisoner - Davros, creator of the Daleks.