Solomon Lane is the main antagonist of Mission: Impossible – Rogue Nation and one of the two main antagonists (alongside August Walker) of Mission: Impossible – Fallout.
He is a former MI6 agent who led The Syndicate, a mysterious international and powerful terrorist organization that consisted of former government agents who faked their deaths betrayed their countries. He was originally chosen to lead the Syndicate by Atlee while it was a government program, only to go rogue with the organization and turn its assassins into his operatives.
He is the arch-nemesis of Ethan Hunt, so much so that Lane is bent on eliminating Hunt and his IMF team in order to prevent them from stopping his plans to create a new world order based on unstoppable accidents and terrorist attacks that will actually turn the entire world into a massive terrorist superpower. Following his apprehension, his followers reform the Syndicate into a similar anarchist faction called "The Apostles". Thereafter, Lane colluded with a notorious extremist named John Lark to accomplish his terrorist agenda in exchange for framing Hunt as the perpetrator of said crimes as revenge over his previous defeat.