This set contains six episodes of Doctor Who in which three different incarnations of the title character battle the villainous Cybermen: Tenth Doctor David Tennant ("Army of Ghosts" and "Doomsday"), Eleventh Doctor Matt Smith ("Closing Time" and "Nightmare in Silver"), and Twelfth Doctor Peter Capaldi ("Dark Water" and "Death in Heaven"). The bonus features include a four-part serial called "Earthshock" starring Fifth Doctor Peter Davison, as well as a documentary on the origins and history of the Cybermen.