For those who don't know anything about it: Apparently with some of the earliest Doctor Who programs the BBC no longer has any master copies, and since they aired before home video recording they're pretty much gone forever save for audio recordings made by fans at the time.

So what they're doing is taking those audio recordings for a story arc from those missing episodes and doing an animated series recreating them.

What a clever idea... I gather this isn't the first time that they've recreated missing moments that way. I find it interesting that I'm far more likely to watch an animated recreation of a sixties episode than I ever would be to watch the original if they could ever find it.