Ermac

"WE ARE MANY; YOU ARE BUT ONE."

- Ermac

"We took your father's arms. We will take all of you."

- Ermac to Jacqui

Ermac was a minion of both Shang Tsung and Shao Kahn, after their deaths he sided with Mileena, but he later betrayed her and served Kotal Kahn.

Mortal Kombat (2011)
Ermac was introduced by Shang Tsung, the latter mentioned that he was created from hundreds of souls, Ermac was put against Liu Kang but he was defeated.

When Sub-Zero, Jax, and Sonya were in the Soul Chamber, they encountered Ermac. Jax tried to punch him, but with the power of his telekinesis, Ermac both stopped and blewed both of the major's arms off, nearly killing him. While Sonya was doing her best to heal Jax, Ermac fought with Sub-Zero and was defeated by him. Ermac reappears again in the second Mortal Kombat tournament, fighting and defeating Johnny Cage.

During the invasion on Earthrealm, Ermac joined the invasion. When Stryker tried to help Kabal after being heavily burnt by Kintaro, Ermac used his telekinesis and threw Stryker in the subway, Ermac approached Striker and fought with him, but he ended up defeated again.

When Cyber Sub-Zero was trying to save the Earthrealm prisoners, Ermac appeared and pushed all the Earthrealm prisoners back so that they would not escape. He confronted Cyber Sub-Zero, however just like their previous fight, Ermac lost and disappeared.

Ermac's MK 2011 Ending (Not Canon)
When Ermac defeated Shao Kahn, all the souls that made his being struggled for his body, surprisely only one managed to become the dominant soul, Ermac went to Outworld and found Sindel and Kitana, upon seeing them he revealed to be King Jerrod, the king decided to serve Sindel and all the Edenian people.

Mortal Kombat X
Ermac returns as an antagonist in Mortal Kombat X, after the death of Shao Kahn he decided to serve Mileena, when D'Vorah revealed the truth about her, he betrayed the former empress and joined with Kotal Kahn forces.

He later fought with Takeda but was defeated, after Kotal kahn declared war against Earthrealm he attacked Jaqui, but the girl managed to overcome him and was forced to escape along with the rest of the army back into Outworld.

Powers and Abilities
Ermac is skilled with Psychic powers, with this power he is able to levitate and teleport himself.

Other appearances
In Mortal Kombat: Annihilation, Ermac fought with Sonya Blade along with Noob Saibot, but he was defeated and killed by Sonya.

In Mortal Kombat: Defenders of the Realm, Ermac appears in only one episode where he used a female ninja named Ruby to fight with Jax and betray the other warriors.