Definately hilarious and an overall good episode.
April awakes in the TMNT Lair and watching her come to grips with the reality of four giant turtles and a rat is next to hysterical. The origin of the turtles is explained by Splinter, although the entire story is not told, it continues in later episodes, but the basics are given here. The remainder of the half hour is spent watching April and the guys thwart (ooo that's a cool word, thwart) Baxter Stockman and his mouser robots. I especially like watching April bond with Don, Raph, Leo, and Mikey each in their own way.