Torkor

The Torks are a race that have conquered Earth and enslaved humanity in an episode of The Outer Limits.

Biology
The Torks are large amphibious humanoids that require oil to keep their skin moist. They are robust creatures, capable of killing an adult human male with a swipe of a claw.

Culture
The Torks are a vain species, requiring numerous bathes of Seragon oil for comfort. The reason for their success in conquering Earth is due to their brainwashing technology that nearly represses all emotions of the subject and makes them loyal to the Tork.

Language

 * Jollum: Slave

Source

 * The Outer Limits: Season 2: Episode 16: "The Deprogrammers"