Tom Baker's second outing as the renegade Time Lord is a solid entry in the venerable British science fiction series' history, and its overall quality is well-matched by the wealth of supplemental material on the DVD. Fan favorite Robert Holmes penned "The Ark in Space," which places the Doctor and his companions Sarah (Elisabeth Sladen) and Harry (Ian Marter) on a seemingly deserted space station many years in the future. Station Nerva is not as empty as it appears, though; onboard are the cryogenically preserved survivors of Earth's destruction, as well as an insectlike alien race, the Wirrin, which are determined to use the humans--and the Doctor--as hosts to grow their monstrous larvae. Holmes's well-paced script (which, like Alien, bears a resemblance to the A.E. van Vogt story "Black Destroyer") allows Baker to flesh out his well-loved take on the Doctor, as well as considerable suspense. --Paul Gaita