Since Eustace is being so grumpy and demanding, Muriel and her dog Courage decide to escape from their everyday life for a while and go on a submarine vacation. However, the submarine is run by their arch-enemy Katz, who says no dogs are allowed on board. Courage disguises as a ventriloquist's puppet and switches places with the real puppet in a briefcase in order to sneak aboard. Meanwhile, Katz makes Muriel a maid and asks her to make tea. Muriel finds a bomb in the tea, and attempts to tell everyone, but this leads to Katz putting her in a cell. Upon hearing of Muriel's capture, Courage tries to seek help, but to no avail, as everybody is enjoying the cruise. Eventually, Katz gets thrown out of the submarine and eaten by a shark, while Muriel and Courage decide to go back home.
- During the fight between the General and Lieutenant, the General drops a 16 ton weight on the Lieutenant. This is a reference to the British comedy troupe Monty Python and their sketch show Monty Python's Flying Circus.
- One of the many Dilly Sez Posters which appear throughout the series can be observed approximately three minutes and forty-nine seconds (3:49) into the episode.
- This episode has been commonly regarded as one of the most famous and funniest Katz episodes.