Season 21 Episodes21
Cast1

Will Lyman
Self - Narrator (voice)
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Ranked #1 of 11 in Season 21•+1.0 vs season avg
When the Twin Towers fell on September 11, 2001, among the thousands killed was the one man who may have known more about Osama bin Laden and Al Qaeda than any other person in America: John O'Neill.

Will Lyman
Self - Narrator (voice)
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"The Man Who Knew" is episode 3 of Frontline season 21. It scored 9.1/10 from 19 votes, ranking #1 of 11 episodes this season (season average 8.1). It aired on October 3, 2002.