Doctor Who: 10 Bizarre Powers You Forgot The Doctor Has
7. Storing Thoughts Inside A Hypercube
Wizards have owls, humans have the Royal Mail, but Time Lords... they have hypercubes.
Described by the Eleventh Doctor as a "messaging system" for Time Lords, hypercubes can store warnings, random thoughts, distress signals - basically anything that a particular Time Lord wants - and can then be sent across time and space.
Hypercubes first appeared all the way back in the late '60s, during the Second Doctor serial The War Games. Here, the Doctor decides to contact the Time Lords, and so, he forms a cube (by entering a meditative trance) in order to send them a message.
More recently, hypercubes were seen in the Eleventh Doctor episode The Doctor's Wife, with the Doctor receiving one at the start of the story, drawing him to a dark bubble universe - the place the cube was sent from.
Imagine being able to write a letter that you can send anywhere in the universe, without being restricted by the laws of time - that's pretty bonkers, right?
We haven't seen hypercubes much in the show (although they've popped up a lot in novels and audio dramas), but considering how useful they have the potential to be, we almost certainly haven't seen the last of them.