Mushmouse is about to give up his life of feuding, when a package containing Speedo pills arrives. Those give Mushmouse a great advantage over Punkin'. When Punkin' discovers them, he takes an overdose.

Mushmouse answers an ad in an attempt to escape Punkin' Puss. He leaves and heads to Beverly Hills, but the posh living environment that he hoped for comes with strings attached. He lives with a mild-mannered rich cat who kind of abuses him in a different way.

Mushmouse orders a Mouse From S.O.M.P. Kit, so he can defend himself from Punkin'. Punkin' gets a similar kit to counter Mushmouse getting them evenly matched.

After Mushmouse gets Punkin' knocked out in a feud, he tricks him into thinking he's become a ghost. Mushmouse proceeds to get Punkin' to spoil him, until Punkin' see's through his trick.

Punkin' Puss gets a knockout, dreaming of the Feudal Age with Saxon mice and their king Mushmouse. Punkin' is faced with Meany Mouse and eventually wakes up from this dream and resumes feuding with Mushmouse.

Mushmouse inherits from his late uncle ₤1000. Punkin' treats Mushmouse better in hope of getting a share. To their surprise the inheritance is one thousand pounds of cheese.

Mushmouse mixes a potion similar to Dr. Jekyl's formula, which turns him into a monstrous mouse. When Punkin' tries it, he unleashes a mean doppelganger of himself.

According to Mushmouse's horoscope book, today is Punkin's unlucky day. Sure enough Punkin' encounters many misfortunes until the next day, which is Mushmouse's turn to face misfortune.