Krypton (planet)
From Tardis Wiki, the free Doctor Who reference
Krypton was a fictional planet.
Suspecting the Seventh Doctor was an alien, Jack Bartlett asked him if he was from Mars or Krypton. (PROSE: Bad Therapy)
Behind the scenes
Krypton was the home planet of Superman in the DC comics. Before he was sent to Earth as a baby, the planet was destroyed.
