Thanos

Thanos is a behind-the-scenes villain that makes a brief appearance during the closing credits of the 2012 film The Avengers. He is portrayed by actor Damion Poitier.

History
He is revealed to have been Loki's benefactor, having provided the Chitauri army used by Loki in his attempted invasion of Earth. When advised by his intermediary (known simply as the "Other") that opposing the Avengers would be "to court death," Thanos glances at the camera and flashes an evil grin.