Unity is a parasitic, monstrous alien creature of Lovecraftian proportions and an enemy of Superman. It is the main antagonist of the titular episode "Unity" of Superman: The Animated Series. It managed to get to Smallville using its spaceship. The alien got most of the citizens to join "him". It tried to take over Earth until it was defeated by Superman and Supergirl.
Unity was an alien parasite that had managed to consume several worlds for ages past before landing on Earth.
Unity's first victim on the planet, Reverend Amos Howell, was sent to "convert" the people of Smallville in Kansas. In less than no time, all citizens of the town were at his disposal. With tentacles, Unity tapped into the people's energy, becoming one with them. It planted a parasitic worm-like spoe in people's brains, feeding off the electrical impulses in their nervous system.
With the people of Smallville under his control, it was his plan to send them on "missionary" work around the world to let the entire planet's population become one with Unity.
Fighting off several agents of Unity, Superman and Supergirl discovered its weakness: x-rays. Using their x-ray vision, they successfully separated Ma Kent and a couple of doctors from the spore's control. They made their way to Smallville, where they separated more victims.
Unity had left its base to merge with Howell, who had by now transformed in a being like Unity. Supergirl prevented the fusion, and set the creature ablaze with a gas canister. As Superman fought Howell, Unity slowly burned to death.
A revival tent that hides the monsterous alien Unity.
An x-ray of an alien spore that comes from Unity.
Reverend Amos Howell in his true form is the right-hand servant of the creature Unity.
It was voiced by Stephen Root who also voiced Reverend Amos Howell.
Both Reverend Howell and Unity shared the common similarities with Franklin Harris and his hippy cult who are completely obsessed with the concept of oneness.