Jon and garfield want to see a movie on T.V.It turns out to be Kung-Fu Creatures On The Rampage 2. They rent a video,and it is the same thing. They go to a movie theatre, and find out that it's not there, but the sequel is!
This is the rarely seen third (according to the user, but I believe it may have been the fourth) opening to the show, 'Garfield and Friends'. Video quality isn't great, but you can still get the point.