Though it exists in every video game with save files or checkpoints, time travel isn't regularly acknowledged -- but when your story revolves around a temporally insulated phone booth piloted by an immortal doctor, it would just be weird not to. Doctor Who: The Eternity Clock, a new downloadable game derived from the popular BBC show, is bringing narratively justified time travel to us early next year, "initially" on PC, PlayStation 3 and Vita. This first entry in a series of three new BBC timelord games is being developed by Supermassive Games, the folks behind PSN's Tumble. Both Doctor Who and companion River Song will be playable, and furnished with the voices and likenesses of show stars Matt Smith and Alex Kingston, respectively. They'll be "challenged to master the complexities of time travel," it says here, with puzzles that can interact with each other across centuries. The BBC hasn't announced a precise release date, but a note on Supermassive's website suggests Doctor Who: The Eternity Clock is being prepared for the PlayStation Vita's launch in late February.