In this, the very first episode of Hanna-Barbera's first TV show, our heroes read reports of spacecrafts from other worlds. One such ship bears a bead on Ruff and Reddy as they nap and take them aboard the craft.

Ruff and Reddy awaken from their nap to find they have been taken hostage by the ship from space.

Ruff and Reddy's robotic captors pursue them with a gun that Reddy gets hold of.

On the metal planet Muni-Mula ("aluminum" spelled backwards), Ruff and Reddy face a two-headed metallic chieftain called "The Big Thinker," who takes our heroes to be assimilated as metal clones.

The duplicating process of Ruff and Reddy begins. Reddy tries to intervene but becomes a robot himself after he gets zapped by the robot brain implanter.

Ruff tries to help Reddy but is followed by a roving mechanical spy.

Reddy gets accidentally mesmerized by the brain waves and under orders of the Big Thinker takes Ruff captive.

Ruff and Reddy discover a scientist, Professor Gizmo, in the dome of the Big Thinker. Gizmo tells how he blasted off in his homemade rocket and was taken prisoner in Muni-Mula.

After Reddy destroys the slumbering inner works of the Big Thinker, he, Ruff and Gizmo are hunted down by a huge robot centurion.

Reddy, having given the Gizmo 2 ship a boost, is left behind on Muni-Mula. Ruff and Gizmo go back after him but are confronted by a flying attack squad of Muni-Mula robots.

Gizmo confuses the Muni-Mula attack squadron by cloaking the Gizmo 2 craft in a dark cloud. Meanwhile, Reddy takes off in one of the metal squadron's head propellers and is mistaken by Gizmo to be one of the metal men.

Gizmo rescues Reddy from his freefall, but now the Gizmo 2 rocket ship is on a collision course with a meteor.

The meteor hits the Gizmo 2, sending it and our heroes on a crash course to Earth, where broadcast media reports its arrival as if it were a UFO invasion.

A baby elephant escapes from a circus and requests Ruff and Reddy to take him home in Africa.

Ruff, Reddy and Pinky board Voo Doo Queen and get locked on board.

Captain Crossbones Jones forces Ruff, Reddy and Pinky to be his crew, but they start to escape.

Ruff, Reddy and Pinky get stranded at sea trying to escape and then they start to sink.

Ruff, Reddy and Pinky cruise to an island. Ruff gets captured whilst exploring.

A hunter named Harry Scary uses Ruff as bait to lure a lion, but the lion and Ruff take off.

Ruff rescues the lion and Harry Scary reveals himself as an elephant hunter.

Before Harry Scary can shoot Reddy, the lion comes to his rescue and all three run for it.

Ruff, Reddy and Pinky escape from Harry and try to get across a river. Their escape log turns out to be a crocodile.

Reddy gets trapped with the crocodiles after saving Ruff and Pinky and Harry Scary comes round.

Ruff and Reddy follow Harry Scary who took Pinky away. Harry Scary makes Pinky lure his mother into a trap.

Harry Scary gets all Ruff, Reddy, the lion, Pinky and his mother exactly where he wants.

The tables turn because of Harry Scary's empty rifle. Ruff and Reddy stowaway back home.

Reddy wins a trailer, so he and Ruff take a vacation to the Grand Canyon. An accident, however, sends them to the ghost town of Gruesome Gulch.

Ruff and Reddy are spooked by Gruesome Gulch's ghosts, which are actually fake ones manipulated by two rustlers.

Ruff and Reddy meet Wooly, a sheepdog whose flock of sheep is being mysteriously stolen. Reddy is coerced into posing as a sheep to catch the thieves.

The sheep thieves in a helicopter pluck Reddy from the flock and take him to Gruesome Gulch.