"Hurry! We haven't much time!"

David Tennant made a surprise guest appearance in the season 3 finale of Teenage Mutant Ninja Turtles on Nickelodeon in the USA last night. The double episode special, Annhilation Earth, saw David make his debut as comic book favourite Professor Honeycutt, aka the fugitive robot known as Fugitoid, right at the climax of the earthshattering adventure.

Fugitoid appears in the final seconds of the episode, arriving to pick up the four Turtles and their companions, saving them on the brink of a global catastrophe. Right now, he appears to be the only ally that they have as the series heads towards its new season, starting next month. David Tennant will guest star as Fugitoid in a story arc across 13 episodes of the new series.

The episode has been uploaded to YouTube. David Tennant's entrance can be seen from about 34m 30s in: