So, in the scene in Guardians of the Galaxy where they are viewing (Spoiler, I guess, but not really) the past where the celestial is using the infinity stone, in the background you see a pyramid. This could be the doing of Kang the Conqueror. Kang was an ancient Egyptian Pharaoh, and he used the time gem to travel to the future, where he is a villain. This would easily tie in with the ongoing infinity gauntlet story-line and he could appear in Guardians of the Galaxy 2, or, more likely, Doctor Strange. This is marveltheory thanks for reading!!!