Doctor Strange

A film is considered part of the MCU multiverse when it depicts alternate realities or timelines, and it is part of the MCU phases that focus on the multiverse concept, such as Phases Four, Five, and Six.

The acquisition of Marvel Studios by Disney in 2009 enabled Phase Four of the MCU, which introduced the multiverse concept central to Phases Four, Five, and Six, fundamentally reshaping the cinematic timeline by allowing alternate realities and dimensions.