TV series
Threshold was a science fiction drama television series that first aired on CBS in September 2005. Produced by Brannon Braga, David S. Goyer and David Heyman, the series focuses on a secret government project investigating the first contact with an extraterrestrial species.
Availability
Checked Jul 22, 2026
Threshold premiered September 16, 2005. We don't have a confirmed streaming, rental or purchase option yet.
Threshold was a science fiction drama television series that first aired on CBS in September 2005. Produced by Brannon Braga, David S. Goyer and David Heyman, the series focuses on a secret government project investigating the first contact with an extraterrestrial species.
Choose an episode, then use the watch options above for the show.
Episode 1
A mysterious alien object attacks a Naval ship and crew. Dr. Molly Anne Caffrey, a government contingency analyst, is contacted by the Deputy National Security Advisor, J.T. Baylock, to investigate the incident along with a special scientific team of her choice.
Directed by David S. GoyerWritten by Bragi F. SchutGuest stars Kevin Durand, William Mapother, Diane Venora, Scott MacDonald, Josh Cruze
Episode 2
Gunneson reappears in Caffrey's house. Meanwhile, Lucas, Nigel and Ramsey try to break down how the alien signals and DNA operate and come up with some interesting theories. Cavennaugh's team tries to locate Gunneson other shipmates.
Directed by Peter HyamsWritten by Brannon Braga, David S. GoyerGuest stars Kevin Durand, Seamus Dever, William Mapother, Diane Venora
Episode 3
When a man at a fast-food restaurant is found with his head imploded, Molly and her Red Team investigate and begin to suspect the involvement of a group of military cadets, and the discovery that the infection has spread beyond the original Big Horn crew.
Directed by Bill EaglesWritten by Anne McGrailGuest stars Cameron Monaghan, Seamus Dever, Jake Abel, Steven R. McQueen, Richard Cox
Episode 4
A patient at an psychiatric hospital in Ohio escapes and Molly believes he may have been infected by the alien signal after paintings of glass trees are found in his cell. After further investigation, it is suspected one of the missing Big Horn crew might be involved.
Written by Dan O'Shannon, Brannon BragaGuest stars Tanner Richie, Michael Papajohn, Cliff DeYoung, Raphael Sbarge
Episode 5
After a shipyard gang bust, a suspected fugitive Big Horn crewmember kills a police detective. Molly and Cavennaugh go undercover as Homeland Security agents. Unbeknownst to them, the real Homeland Security department is on the case.
Directed by Tim MathesonWritten by André BormanisGuest stars Lauren Tom, Joe Penny, Viola Davis, Diane Venora
Episode 6
As the signal from the Big Horn invades a Miami rave, the team investigates who have been infected, trying to prevent the signal from spreading to the population.
Directed by Bill L. NortonWritten by Michael SussmanGuest stars Kevin Alejandro, Amanda Fuller, Ewan Chung
Episode 7
Molly and Cavennaugh investigate a newspaper leak regarding the Threshold program which might turn out to be an inside job. The Red Team look into a case of residents of a small town dreaming of trees made of glass.
Directed by Norberto BarbaWritten by Anne McGrailGuest stars Kevin Kilner, Stephen Lee, Jake Abel, Diane Venora, Jon Polito, Jesse Burch
Episode 8
Molly and Cavennaugh discover some strange happenings in a missing Big Horn crew member's hometown when they investigate the disappearance of a Threshold field agent.
Directed by Thomas J. WrightWritten by Andrew Colville, Amy BergGuest stars Kevin Durand, James Frain, Deborah Strang
Episode 9
When three women from completely different walks of life appear to be infected, Molly and the Red Team discover the connection among them and must locate the common cause.
Directed by David JacksonWritten by Barbara NanceGuest stars Elizabeth Berkley, Michole Briana White, Denise Dowse, Shane Conrad
Episode 10
Molly and Baylock realize the Threshold detainees must be moved immediately to a more secure facility in West Virginia when a prisoner attacks and infects a security guard, then tries to break himself and other infected prisoners out of their cells.
Directed by Paul ShapiroWritten by Bragi F. SchutGuest stars Michael Papajohn, Amanda Fuller, Matt Corboy, Jake Abel, Scott MacDonald
Episode 11
Lucas is infected with the alien DNA from something he ate. The infectees have harvested crops with the alien DNA. Caffrey must find a way to stop what could be nearly 200 new infectees. Also, one of the aliens approaches her with an interesting revelation.
Directed by Félix AlcaláWritten by Dan O'ShannonGuest stars Jacqueline Kim, Catherine Bell, Matthew John Armstrong, Scott MacDonald
Episode 12
When a number of infectees and seemingly innocent people are killed, it becomes apparent that someone is going after people affected by the alien signal, and is locating them via their heightened brain waves. How is the killer linked to Bighorn crewman Manning, and does his method of finding his victims mean that Molly, Cavennaugh or Lucas could be next on his list?
Directed by John F. ShowalterWritten by Michael SussmanGuest stars Jacqueline Kim, Scott MacDonald
Episode 13
Molly Caffrey and Cavennaugh go out to a town call Allenville in search of a Doctor who they think is infected and find more then they were looking for. Meanwhile things at threshold get heated with the pregnancy of the infected woman coming to an end.
Directed by Oz ScottWritten by Anne McGrailGuest stars Wayne Duvall, Austin Majors
Episode information updated Jul 23, 2026
Available now in United States
These shows are available now and closely match Threshold.
Carla GuginoDr. Molly Anne Caffrey
Brian Van HoltSean Cavennaugh
Brent SpinerDr. Nigel Fenway
Rob BenedictLucas Pegg
Peter DinklageArthur Ramsey
Charles S. DuttonJ.T. Baylock
Lauren TomJanet TAM
Joe Penny
CBSUnited States
Paramount TelevisionUnited States
Phantom FourUnited States
Heyday FilmsUnited Kingdom
CBS StudiosUnited States
