Vectorman is a green robot composed of orbs bound by some invisible energy field and Main Protagonist. He was left in charge of a sludge barge that delivers radioactive sludge to the sun, when humanity left Earth, hoping to return after robots (or in this case, Orbots) cleaned up all the pollution they left behind. Being the only orbot in space when a nuclear warhead was attached to the orbot leader, Vectorman was unaffected by WarHead's mind-control and returned to find a world of orbots serving their new evil master, WarHead, who planned to doom humanity upon their return.
Vectorman did not rest until he had defeated all the evil orbots produced by WarHead, and in the end, WarHead himself. Vectorman's second great exploit was freeing earth of an evil race of insectoid creatures that had invaded during another barge delivery trip.
In 2049, the human population of Earth embarks on a migratory voyage to try to colonize other planets. They leave mechanical "orbots" to clean up the mess they made on Earth through littering and pollution. Raster, a high-level orbot who watches Earth through a planet wide computer network, is accidentally attached to a working nuclear missile by a lesser orbot and goes insane, becoming an evil dictator named Warhead. He declares himself ruler of Earth, and begins preparing to execute any humans who dare return to their planet.
Vectorman, a humble robot in charge of cleaning up toxic sludge by simply discharging it into the sun, As he lands on Earth after his last trip, and he finds chaos and confusion. Because all the other Orbots are controlled by Warhead (Vectorman having not been affected because he was away), Vectorman takes it upon himself to destroy the errant orbot and restore peace to Earth.
After saving Earth from Warhead in the previous game, Vectorman's sludge barge is targeted and destroyed by a missile. Vectorman escapes, parachuting down to the planet to battle with the Earth's multitudinous enemy; mutant insects. Now it is up to Vectorman to fight through the mutant bugs and find the most fearsome source infestation; the evil Black Widow Queen.