Countdown to Impact
- Episode aired Dec 3, 2009
- TV-PG
- 44m
Janice L. Bishop
- Self - Principal Investigator: SETI Institute
- (as Dr. Janice L. Bishop)
Mark Boslough
- Self - Physicist
- (as Dr. Mark Boslough)
Chris Broyles
- Narrator
- (as Christopher Broyles)
Clark Chapman
- Self - Senior Scientist
- (as Dr. Clark Chapman)
Steven R. Chesley
- Self - NASA
- (as Dr. Steve Chesley)
Ron de Poorter
- Self - Pilot
- (as Captain Ron de Poorter)
David S. Dearborn
- Self - Research Physicist
- (as Dr. David Dearborn)
Petrus Matheus Marie Jenniskens
- Self - Astronomer
- (as Dr. Peter Jenniskens)
Richard A. Kowalski
- Self - Astromomer
- (as Richard Kowalski)
David Morrison
- Self - Senior Astrobiologist
- (as Dr. David Morrison)
Muawia Hamid Shaddad
- Self - Astronomer
- (as Dr. Muawia Hamid Shaddad)
Andrew Steele
- Self - Phd., Astrobiologist
- (as Dr. Andrew Steele)
