| Beginning with the 1993 bombing of the World Trade Center and ending on the morning of 9/11, the draws on detailed information from the 9/11 Commission Report to take viewers on an unforgettable journey through the events that presaged that fateful day -- to understand what went right and wrong, and what can be learned from this crucial eight-year period. |
| Name | Character | Episodes |
|---|---|---|
| Pip Torrens | Paul Kessler | 2 |
| Wendy Crewson | Valerie James | 2 |
| Stephen Root | Richard Clarke | 2 |
| William Sadler | Neil Herman | 2 |
| Harvey Keitel | John O'Neill | 2 |
| Sasha Roiz | Nick Demoia | 2 |
| Donnie Wahlberg | Kirk', CIA operative | 2 |
| Patricia Heaton | 2 | |
| Dan Lauria | George Tenet | 2 |
| Frank John Hughes | Bill Miller | 2 |
| Riz Ahmed | Yosri | 2 |
| Kevin Dunn | Samuel 'Sandy' Berger | 2 |
| Cameron Bancroft | Mike McCormick | 2 |
| Penny Johnson Jerald | 2 | |
| Michael Murphy | William Cohen | 2 |
| Michael Benyaer | Khalid Sheikh Mohammed / 'KSM' | 2 |
| Noam Jenkins | Marwan Al-Shehhi | 2 |
| Nabil Elouahabi | Ramzi Yousef | 2 |
| Barclay Hope | John Miller | 2 |
| Amy Madigan | Patricia Carver | 2 |
| Amy Madigan | Colonel Raymond Malik | 2 |
| Shaun Toub | Emad Salem | 2 |
| Mido Hamada | Massoud | 2 |
| Shirley Douglas | Madeline Albright | 2 |
| Salvatore Antonio | Ahmed Ressam | 2 |
| Katy Selverstone | Nancy Floyd | 2 |