A Bluebird gets trapped in Garfield's neighbor's garage leaving her eggs abandoned, forcing Garfield to look after them. The eggs hatch, and call Garfield mother. This episode marks the first appearance of Garfield's rival Harry, who is determined to eat the chicks.

Garfield disguises himself as "Catzilla" for Halloween, but people mistake him for the real Catzilla, a deadly creature who escaped from the zoo.

Garfield and Odie get their bodies swapped by a Saturnian alien when it finds out Odie is tormented by Garfield. Odie wanders off to all the people who hate Garfield without knowing they will hurt him so Garfield must protect his body from the neighborhood dogs, Herman Post and the Chef.

Odie digs up some bones and finds that they are from the very rare Brachiosaurus. Garfield tries to sell them to the local museum, but the museum curator instead wants to compulsory purchase and demolish Jon's house to search for more dinosaur bones.

Jon tests a cleaning robot.

Garfield and Odie watch a movie about a villain named Silent Jack and mistakenly believe Jon, with recent tooth surgery, to be Silent Jack. In the end Garfield, Odie and Squeak find out they were attacking Jon, but the real Silent Jack robs them.

Nermal finds a cat called "Agent X" who claims to be a Secret Agent, but really a runaway cat. Garfield becomes jealous as Agent X tells everyone about his adventures, so Garfield tries to prove he is a house cat named "Fluffykins".

Squeak and his family move in to Jon's house while Jon and Odie are out. Garfield allows Squeak's family to remain in the house on the condition that they be his servants. Jon comes back and Garfield has to remove Squeak and his family before Jon called Rat-Tator Pest, who's hefty bill would have meant that Jon would not be able to afford lasagna for years.

Garfield gets an awful tasting Pizza from Mama Meany's Pizza Palace, Vito's rival. Mama Meany is putting Vito out of business through coupons, contests and discounts and plans to expand the restaurant to take over Vito's. Garfield arranges for Eddie Gourmand to compare Mama Meany pizza with Vito's, bringing the closure of Mama Meany, and resumed success of Vito.