Exodus part 1, although slightly worse than it's second part, is one of the best episodes this show has to offer. It begins with Splinter having a vision of his master, Master Yoshi, showing him that the time has come for the final battle with the Shredder. Cleverly made vague and brilliant, this scene proves as a good beggining to the episode.
As it furthers, the turtles and Splinter gather Casey, April, Fugitoid, and Leatherhead to break in to Oroku Sakai's going away party, aiming to prevent him from having his revenge on the Utroms. Soon Agwent Bishop and Stockman get involved, trying to take his spaceship to study it.
The result is great action scenes, dialogue, and plot. This episode is truly a good beggining for the turtl;es final battle with the Oroku Sakai-Shredder.