Where exactly does the Half Shell Heroes special take place in the timeline?
 

We know that it has to take place post the Triceraton invasion because they are referenced in the special. But obviously the Turtles are back on Earth so does anyone have any ideas when it's supposed to take place? Have the writers chimed in on this?

Anytime after they get back to Earth.

Alternate universe

Is it? It's the same actors and characters, etc.

You can think whatever you want with it. I place it sometime mid-Season 4 myself.

One of the writers Peter Di Cicco said this:

Perhaps Half Shell Heroes is meant to be a part of the regular series continuity. However, the regular series isn't necessarily supposed to be a part of Half Shell Heroes continuity...

I think Half Shell Heroes is non canon, and set in a more light hearted continuity.