OddlyAub

Imagine a new way to travel to different universes. Time travel would be possible by allowing the Tardis to target your questlines by resetting or progressing a certain questline to a point where you have or haven't completed a certain quest. Bonus, it would also allow companions from one universe to come with you to a new one. I know the Tardis isn't meant for universe travel, but it would be a fun way to have it.