The citizens on the planet Zandrus are happy. It is evening and they are completing the preparations for the coronation of Princess Kimnos on the following day. Suddenly the city square is plunged into darkness. Blows, shouts and screams are heard. When the lights are turned on again, the terrified citizens discover that the princess and her brother Prince Darnos have been captured by the Voodons; evil creatures that live in the valley outside the city walls. Fearful of their powers, none of the citizens is prepared to form a rescue party. Suddenly two figures are seen approaching the city gates. Thinking they could be Voodons, Queen Fara orders the citizens to seize them. The pair are Stellar and Astrid, two intergalactic female musicians. The Zandrusites apologise for their mistake and explain about the kidnapping, The musicians volunteer to enter the Valley of the Voodons and rescue the royal pair. The Zandrusites protest but Stellar shows them her powerful wrist computer named STINC.
The prince and princess, chained together, are being taken through the forest by the Voodons. The darkened forest echoes with howls and cries, the flapping of wings and the slithering of strange creatures on the forest floor. At first the pair gasp and cry out in fear but blows from their Voodon guards silence them. The occasional glimmer of moonlight through the densely packed trees enables them to study their captors. The Voodons are short humanoid creatures, covered in black fur, with glowing red eyes.
Eventually they arrive at the Voodons' lair and are separated. Kimnos is taken to a cell by the Voodon leader Stark, and his evil companion Baron Wastes. They taunt the princess and inform her that she can never be rescued. They are accompanied by a group of ragged humanoids called Zombos, the Voodons' slaves, who will be guard her. She is in despair.
Meanwhile Stellar and Astrid are travelling through the valley jungle towards the Voodons lair, guided by STINC. Their progress is slow due to the darkness of the forest, and as they move forward they are acutely aware of the strange growls and howls that surround them.
Eventually they arrive at the entrance to the Voodons' lair and enter. Avoiding several groups of Voodons, with STINC's map they reach the princess's cell which they enter. They identify themselves to Kimnos and the three of them start to leave. However the Zombo guards advance menacingly towards them. Stellar, using STINC to imitate Stark's voice, orders the Zombos back. Stark and the baron abruptly arrive, take control and inform the musical pair that they will be turned into Zombos during an unveiling ceremony for Baron Wastes' new machine.
In Voodon Stadium Baron Wastes unveils The Destructor, that creates magdonite from tree trunks that are crushed by the machine's mechanical arms. Magdonite is a deadly substance that can wipe out towns and cities. In a skirmish Stark and the baron are seized by the arms and Stellar's fingers hover over the Crush control while the luckless pair beg for mercy. But the prince and princess are seized by two Voodons who hold knives to their throats, resulting in a standoff. Suddenly the Zombos stand upright, attack and overpower the Voodons.
From the stadium entrance comes a shout and everyone looks round to see Queen Fara hurrying forward, followed by a large group of Zandrusites. Kimnos and Darnos exchange hugs with their mother and then watch in amazement as the Zandrusites begin to recognise their long lost friends and relatives among the Zombos, who had been captured by the Voodons. STINC then informs the group that the Voodons used drugs to create to enslave the Zandrusties as Zombos.
After the happy reunion, the Zandrusites face two problems. Firstly, what should they do with the Voodons who include men, women and children? Secondly, what should be done with Stark and Baron Wastes? After some discussion they come up with a creative solution.
