Since 2016's Doctor Strange, Benedict Cumberbatch's Master of the Mystic Arts has embarked on some incredible adventures in the MCU. Adapted from Marvel Comics' Doctor Stephen Strange, who debuted in 1963's Strange Tales #110, Benedict Cumberbatch's Doctor Strange has been a core character in the MCU since his debut in Phase 3. Despite being introduced later than many of the MCU's other cornerstone heroes, Doctor Strange played a pivotal role in Avengers: Infinity War and Avengers: Endgame, and has become one of the most important figures in the MCU's Multiverse Saga, setting himself up for an even more exciting future.
https://screenrant.com/doctor-strange-mcu-timeline-explained/