In celebration of TMNT's 25th Anniversary, a feature-length special was produced feature the Turtles (and other characters) of the original 1987 cartoon, the 2003 cartoon and the original Mirage comic. Its actually not too bad, though a lot of aspects of the '87 Turtles seem to be taken to the extreme -- seriously, were they THAT obnoxious? Its been ages since I watched the original cartoon, but I'm pretty sure they were capable of being serious.
I might get around to doing a proper review for it at some point, depending on if I get the time.