Phase 3 of Marvel's Cinematic Universe will kick off next year with "Captain America: Civil War" and conclude with the two part "Avengers: Infinity War" films coming in 2018 and 2019. We already know that Thanos (Josh Brolin) will be the big bad looming large over both films. But we also know that other villains (some we know, some don't) will also be present.

Acting-Auditions, which has been on top of their MCU casting details, recently revealed some information about a potential villain for "Infinity Wars" and he may be introduced in "Guardians of the Galaxy 2."

"Auditions are now getting underway for the Marvel Studios feature film 'Avengers: Infinity War - Part I' lead and supporting roles. The auditions for new lead and supporting roles will be taking place in Los Angeles, CA. The film is the first in a two-part sequel in which Thanos plays a major role, along with the Magus. Adam Warlock's bad side, the Magus, separates from his body and assembles the Infinity Gauntlet. Magus creates doppelgangers of Earth's heroes as part of his plan to recreate a universe of evil."

The description also reveals that Tom Hiddleston's Loki will be in "Avengers: Infinity Wars" as well. It sounds as if many of the Phase 3 villains will be leading up to "Infinity War."

Adam Warlock has long been speculated to be Peter Quill's father in the MCU. This would help marvel's cosmic and earth bound storylines converge. "Guardians of the Galaxy" director/writer James Gunn has said that the identity of Quill's father will be revealed in the sequel.

"Guardians of the Galaxy 2" will hit theaters on May 5, 2017 while "Avengers: Infinity War Part I" will debut in May of 2018.