Magus

Magus is a villain of The Avengers and the henchman of Thanos. He appeared in Avengers: Infinity War, Captain Marvel and Avengers: Infinity Gauntlet.

Avengers: Infinity War
To be added

Captain Marvel
Magus wanted to calm down Thanos but that didn't succeed. Thanos said that he will attack them and kill them all.

Avengers: Infinity Gauntlet
To be added

Allies

 * Thanos † - Boss

Enemies

 * The Avengers