Corvus Glaive

Corvus Glaive is a Marvel Comics character and antagonist who appeared in Avengers Assemble and Guardians of the Galaxy, and appears in Avengers: Infinity War.

Background
Corvus Glaive is one of Thanos' second-in-command, and a general to Thanos' armies. He can only die if the blade of his glaive is broken.

Avengers Assemble
Corvus Glaive first appeared in the Season 2 two-part episode "New Frontiers", as a member of the Black Order. He and the other members infiltrate a special prison, where they end up taking out its defences, and free their master Thanos. When the Korbinite Jeter Kan Too of New Korbin begs the Avengers to save them from mysterious invaders, the team discovers that Thanos and his Black Order are plundering New Korbin.

His second appearance was in the other half of the episode "Avengers World", in which the Black Order attack Earth, finally planning to take over the planet by destroying the Avengers.

Trivia

 * "Corvus" is Latin for "crow."