Christian Tessier was the last one to be slimed and watered.
Although it was never mentioned this was the last episode, there were some suggestions. One such hint occurred where Lance packs up Chris' bags and tells him to get out. The other with the cast replaced by Alfalfa robot.
Thirteen days after this show aired on the States, Nickelodeon Studios opened, along with the rest of Universal Studios Florida. Les Lye (as Ross) made a cameo appearance in that special. Until Project 131, this was the last time Ross appeared on TV.