After having a terrifying dream about the horrors the Doctor has faced, Splinter in scared to send his sons anywhere. Stuck in the lair, it's no wonder the turtles, April, and a stow-away Karai, would hop in a blue box that's bigger on the inside that can travel through time and space. Join the turtles on their adventure where the learn just how big the universe is.

The 11th Doctor visits the sewers of the '03 turtles as Donatello finishes up rebuilding a Dalek. What could possibly go wrong? An alien invasion? You don't see those everyday...Wait, the Doctor does see them everyday...

A murder in New York, that's nothing new. Right? Except the murdered are left as skeletons and the murderer is a creature of unknown species. Sounds like a job for the turtles... and they're going to need help. TMNT/Doctor Who Xover