Ruff and Reddy help Dr. Gizmo to protect his valuable Chickasaurus egg from some thieves.

Killer and Diller in mummy guises swipe the Chickasaurus egg, wrapping Ruff and Reddy in their mummy wrappings.

Gizmo, Ruff and Reddy pursue Killer and Diller, but the Chickosaurus egg tumbles out of their truck and towards our heroes.

The Chickasaurus falls down a cliff and cracks. When Ruff, Reddy and Dr. Gizmo reach the egg, it begins to hatch.

The Chickasaurus has only managed to partially hatch from the egg. When it does hatch Killer and Diller arrive.

As Killer and Diller try to take the Chickasaurus away, but Ruff, Reddy and Dr. Gizmo get tangled with the running Chickasaurus.

As the Chickasaurus becomes airborne, Killer and Diller follow by helicopter all the way to a secret prehistoric jungle.

After a Brontosaurus blows Killer and Diller away, Ruff and Reddy try to flee from the jungle but they run towards a T-Rex.

Ruff, Reddy and Dr. Gizmo take shelter in a cave from a T-Rex. In the darkness they see a pair of eyes.

Ruff, Reddy and Dr. Gizmo are met by a cave boy called Ubble-Ubble, who knocks out the T-Rex. Killer and Diller kidnap Ubble-Ubble.

Ubble-Ubble bats Killer and Diller but they recapture him and Ruff, Reddy and Dr. Gizmo are confronted by a sabre-toothed tiger.

Ubble-Ubble lands in the chickasaurus nest where the chickasaurus is nursing a pair of eggs.

Killer and Diller try to steal the chickasaurus eggs but are flattened by Reddy. Ubble-Ubble joins the team back home (where Gizmo has presumably adopted him) and becomes a little league baseball sensation.

At the Grand Canyon, Ruff and Reddy hear of rumors of a pint-sized pony and as to the validity of their existence. Harry Scary hears of the rumors as well.

Harry Scary sends Reddy on his out-of-control donkey Poco Loco, who disappears in a burrow.

Ruff and Reddy make their way through the burrow where they see Poco Loco has made friends with a pony no bigger than Reddy's hand.

Harry Scary tracks the Pee-Wee Pony's hoofprints, and Pee-Wee leads Harry on a chase.

Harry lassos Pee-Wee but the pint-sized pony refuses to give up.

Pee-Wee escapes Harry's clutches and hides out in Reddy's hat. Poco Loco gives it to Harry "in the end."

Harry Scary tries to hold our heroes at gunpoint in exchange for Pee-Wee, but Poco Loco steals Harry's gun. As Pee-Wee heads back home, Harry lies in wait for him.

Harry Scary captures Pee-Wee in a sack. Pee-Wee's mother runs to alert Poco Loco, Ruff and Reddy.

Harry Scary escapes with Pee-Wee in a motorboat, pursued closely by Ruff and Reddy.

Harry takes Pee-Wee to his carnival, where he plans to get rich off using the pint-size pony as an attraction.

As our heroes head for Harry Scary's carnival, Pee-Wee goes through indignities as a performer in Harry's show.

Pee-Wee is locked in a strongbox as Ruff, Reddy and Poco Loco infiltrate the carnival.