Shadow probes appear on the peaceful, primitive planet Idylla, and manage to capture the planet's inhabitants, the Dremloks. Meanwhile, Mighty Orbots undergoes training maneuvers before preparing to deliver an energy scanner to Galactic Patrol, but first are sent to investigate what's happening on Idylla. The Orbots separate to cover more ground, and Tor, Crunch, Bort, Boo, and Bo are all overcome by the Dremloks' mind control. The Dremloks and the Orbots are then put to work mining Energite Ore for Shadow.
The Dremloks also try to ensnare Rob and Ohno, but Ohno uses the energy scanner to block their mind control and escape. They reprogram Bo and Boo, who attempt to free the other Orbots. Unfortunately, Tor, Crunch, and Bort attack them and after a brief battle Bo and Boo manage to return them to their old selves.
The Orbots combine into Mighty Orbots and set out to destroy the Shadow satellite which is not only controlling the Dremloks, but is also about to overload the Energite ore, which would destroy the planet. After battling a horde of guard drones, Mighty Orbots manages to destroy the satellite at the last second, and the Dremloks are left to live in peace.