Roland Angle

饰：Himself - Structural Engineer

Stephen Barasch

饰：Himself - High-Rise Architect

乔治·W· 布什

George W. Bush

饰：Himself - President of the United States of America

Andrew Card

饰：Himself - White House Chief of Staff

Jonathan Cole

饰：Himself - Civil Engineer & 9-11 Researcher

Steven Dusterwald

饰：Himself - Structural Engineer

Monica Gabrielle

饰：Herself - Lost Husband Richard

Richard Gage

饰：Himself - Architect & Founder, AE911Truth.org

Scott Grainger

饰：Himself - Forensic Fire Engineer & Fire Investigator

David Ray Griffin

饰：Himself

Steven E. Jones

饰：Himself - Physics Professor Emeritus, Brigham Young University

Mindy Kleinberg

饰：Herself - Lost Husband Allen

David Hooper

饰：自己

杰西·文图拉

Jesse Ventura

饰：自己

Lynn Margulis

饰：Self - Professor, University of MA,(as Dr. Lynn Margulis)

Robert Marr

饰：Self - Battle Commander, NEADS,(as Colonel Bob Marr)

Robert E. McCoy

饰：Self - High-Rise Architect

Bob McIlvaine

饰：Self - Lost Son Bobby,(archive footage)

Kamal Obeid

饰：Self - Structural Engineer

Lorie Van Auken

饰：Self - Lost Husband Kenneth,(archive footage)

Leslie Young

饰：Self - High-Rise Architect & Former Firefighter,(as Les Young)