Ten of Muhammad Ali's former rivals pay tribute to the three-time world heavyweight champion.

In the Company of Kings follows a fight fan's unforgettable journey into the dark heart of American boxing to talk to eight former World Champs and those closest to his hero, Muhammad Ali, about race, struggle, victory, defeat and picking yourself up off the canvas. Features Larry Holmes, Bernard Hopkins, Tim Witherspoon, Earnie Shavers, the Spinks brothers, Bob Arum and more.

Considered one of the hardest-hitting heavyweight boxers of all time, Earnie Shavers took on all the best of his era including Muhammad Ali, Larry Holmes, and Jerry Quarry. This is a look back at his career and how he got into the sport of boxing.

A look back at boxer Jeff Sims, an ex-convict famous for busting Muhammad Ali's lip in a sparring session who would later meet a tragic end as he could not escape his own criminal past.

Ten of Muhammad Ali's former rivals pay tribute to the three-time world heavyweight champion.