That's probably it, back when I was a kid the local independent station as well as the local Fox station since Fox didn't have much original programing in the late 80's early 90's would sometimes show multi-part mini-series during 8pm-10pm time slot. I remember them showing both the original Turtles mini-series as well as the Eye of Ragnok(sp) from season 2, in which the Turtles and Shredder have to search for the three pieces to a broken alien jewel that has magical powers, the first piece Shredder used to shrink the Turtles.