Chitauri

The Chitauri are race of aliens from the 2012 movie The Avengers and are Loki's personal army.

In the film, the Chitauri are a race of grey-skinned, six-fingered reptilian humanoids that have a heavily cybernetic or biomechanical physiology. These Chitauri display none of their shapeshifting capacities from the Ultimate universe, but have highly advanced technology, such as hovercraft-like skimmers, staves that also operate as rifles and large airborne troop carriers (known as Leviathans) that resemble biomechanical arthropods or limbless reptiles, encased in mechanized armor. They seem to have a neural link to their mothership as, when Tony Stark/Iron Man destroys the ship with a hijacked nuclear missile, the aliens seem to drop dead instantly. They are thought to be led by one hooded Chitauri called "The Other" (played by Alexis Denisof). During the conversations had between the Other and Loki, the Other repeatedly mentions a powerful being later revealed in a mid-credits scene to be Thanos.