When Chipper is injured by a giant dog, Barry and the others must turn to a giant veterinarian and his sadistic son for assistance.
Suffering from sunstroke, Father Unwin is retired to bed and prescribed sleeping pills by Dr. Brogan. In his fevered dreams, Unwin finds himself on a dangerous mission to deliver medical supplies to Bishopsville, flying in Gabriel to Africa where he and Matthew are captured by natives and attacked by mercenary fighter jets.
While coming home from getting pizza, Shaggy finds a violin case full of money. While calling the gang Scooby-Doo goes to help an injured poodle and the money is taken. The gang suspects that the money was fake.
George is the country's top computer but somebody is attempting to sabotage him via shooting, acid corrosion and shutting him down. He is able to send part of a message on a print-out but the Avengers are still none the wiser as to who is trying to disable him and call upon his creator for clues.
A new weapon is about to be tested and Hogan schemes to get the blueprints to foil its detonation.
When Cindy's doll, Kitty Karry-All turns up missing, she accuses Bobby. This leads to a mock trial with Alice as the judge to determine Bobby's guilt or innocence. Then later Bobby's kazoo turns up missing and he blames Cindy.
Billy Blue is captured by the Apaches, who use him as a pawn in a bartering game to stave off an impending cavalry attack. Although he denies pillaging an army weapons patrol, Apache Chief Morales anticipates a retaliatory attack by the cavalry and threatens the life of his hostage, Blue, unless his terms are met. John Cannon, who believes the Indians to be innocent of the pillaging charge, pleads for time, and vows to bring in the guilty parties in a desperate attempt to save his son.
At Tabitha's birthday party, Uncle Arthur volunteers to do tricks. He does a classic rabbit in a hat trick, and instead of a rabbit, he pulls out a Playboy bunny! Darrin's new client, A.J. Sylvester, comes to the party with Larry and instantly falls for Bunny. When A.J. and the bunny have lunch together, A.J.'s ex-girlfriend comes up, sees him and leaves in anger. Samantha invites A.J. and Bunny to dinner and A.J. announces that they are to be engaged. But that doesn't last long when Bunny's rabbit qualities finally come to light.
Phil Silvers as con man Shifty Shafer. Partly filmed in New York.
Young Sister Bertrille uses her ability to become airborne to help others, whether they want it or not. Although her aims are always benevolent, her means are often bemoaned by Mother Superior. The other Sisters must cope with their beloved Sister's aerodynamics and antics as she flies in and out of trouble.
Bronson stays at the home of Oliver a retired pressman who loves and loves to talk. Russ Faber learns that Bronson plans to enter a local motorbike race and becomes obsessed with defeating Bronson in the race.
The squad is unaware that the writer they are assigned to protect, has a split personality.
Jeannie blinks Tony off of a plane in order to plan for a party, but when she puts him back in it he mistakenly lands in Havana, Cuba instead of Puerto Rico thanks to Jeannie's guidance of the plane.
Matt, his hardened prisoner Charlie Noon, an Indian woman and her white stepson are tracked by the Comanches as they try to cross the desert. The Indians are going to kill all of them unless Matt hands over the woman, because she left the Comanche leader years before.
Lucy Carter, a widow with two teen children, takes a job as a secretary for her stuffy brother-in-law.
The Aquatank, a new computer-controlled military vehicle, is to be demonstrated to the NATO heads of defence at the World Army Experimental Vehicle Division base. Anticipating sabotage, the Bishop assigns Father Unwin and Matthew to check security arrangements at the base, and Matthew is on board the Aquatank when it is re-programmed to target the oberservers' blockhouse!
Valerie is forced to act as a toy ballerina in a giant's scheme to kill his rich uncle.