The Collector (Marvel Cinematic Universe)

"I present to you...Taneleer Tivan, the Collector!"

- Carina introducing the Collector.

The Collector was a minor villain in Thor: The Dark World and the quarternary antagonist of the 2014 film, Guardians of the Galaxy.

Thor: The Dark World
He made a minor cameo in the post-credits scene in Thor: The Dark World, he is tasked from Sif and Volstagg to protect the Aether and keep the stones separated, because it would be dangerous. After they leave, Tivan utters the phrase, "One down, five to go".

Guardians of the Galaxy
Taneleer Tivan, aka The Collector, is the obsessive keeper of the largest collection of interstellar fauna, relics and species in the galaxy. An enigmatic figure, The Collector operates out of a place in space aptly named Knowhere. When he encounters Peter Quill and his band, The Collector attempts to strike a dubious bargain.

Trivia:

 * It is speculated that he is a weapon supplier to Thanos.
 * The Collector is the oldest living character to appear in the Marvel Cinematic Universe, being significantly older than Odin, likely being even older than Malekith.