After pretending to be the Silver Surfer to gain access to the Infinity Watch's secret base on Earth, the Lord of Hell, Mephisto, has stolen the coveted Time Stone. The Demonic Entity was last seen using the Time Stone to travel back in time to the 1980s, back when the original Captain Marvel still lived.
Source：https://www.cbr.com/mephisto-just-stole-infinity-stone-what-is-he-planning/
