Raphael, Donatello and others in “Unfinished Business”

What... what just happened? We're actually alive?

I think we... we went back in time, about six months, based on where the Earth is in its revolution around the sun.

Six months? Then that means everyone's back? Including Master Splinter?

Yes, Leonardo, but only for six months, and then, the Earth is doomed once more. Apologies.

I get it. We stop the Triceratons before they ever get a chance to use the Black Hole on Earth.

Indeed. The Triceratons are spending this time searching the universe for the three fragments of the black hole weapon. Many years ago, the Utroms broke the machine into three pieces, hiding each fragment in the safest parts of the galaxy they could find. We must find them before the Triceratons find the fragments and reassemble them.

And if we mess up, we just time travel back, right?

No, no, no, no. A Black Hole prevents repeated localized time travel because even time is subject to its attraction. If we fail, Earth is lost forever. But on the bright side, whoever gets a second chance?

So why do you care, alien robot dude? Why are you helping us?

Yeah, who are you anyway?

My name is Professor Zayton Honeycutt. I'm a friend of the Utroms. It was Bishop who sent me, and plus, I've always wanted to see Earth.