In Los Angeles, an ex-con takes the underground fighting world by storm in his quest to fulfill a promise to a dead friend.

In 1964, a brash new pro boxer, fresh from his olympic gold medal victory, explodes on to the scene, Cassius Clay. Bold and outspoken, he cuts an entirely new image for African Americans in sport with his proud public self confidence with his unapologetic belief that he is the greatest boxer of all time. To his credit, he sets out to prove that with his highly agile and forceful style soon making him a formidable boxer who soon claims the heavyweight championship. His personal life is no less noteworthy with his allegiance to the Nation of Islam, his friendship with the controversial Malcolm X and his abandonment of his slave name in favour of Muhammad Ali stirring up controversy. Yet, at the top of his game, both Ali's personal and professional lives face the ultimate test with the military draft rules are changed, making him eligible for military induction during the Vietnam War....

Agent Augustus Gibbons has selected an imprisoned former US Navy SEAL Darius Stone, a new agent in the XXX program, travels to Washington D.C., where they track a splinter faction of the U.S. military that attempts to overthrow the U.S. government and assassinate the President, led by Secretary of Defense and former 4-Star General George Deckert, Stone's former commanding officer whom he once led a mutiny against. But he's been targeted for assassination by a radical splinter group of dissenters deep within the United States government. The new XXX agent must uncover the insurgents from within. It is the nation's only hope to stop the first coup d'etat in American history.