Broadcasters
- Australia: Network Ten Aired On Network Ten on December 18, 2005, moved to late Wednesday nights, later moved to Ten HD. Showed at 10.30pm Tuesdays, the channels aired all 13 episodes. Sci Fi Channel (Australia) began airing episodes on Sunday afternoons on February 21, 2010.
- Arab World: MBC Action, beginning on August 11, 2007.
- Belgium: VT4, beginning on January 3, 2010. Only first 9 episodes aired.
- Bosnia and Herzegovina: FTV, beginning on January 3, 2009,
- Brazil: AXN, beginning on August 28, 2006, occupying a Lost time slot between seasons 2 and 3.
- Canada: Space
- Croatia: Nova TV, beginning January 3, 2008
- Chile: Red TV
- Denmark: TV 2
- Finland: Nelonen
- France: M6
- Germany: ProSieben, beginning March 3, 2008 under the title Nemesis: Der Angriff - including the unaired episodes.
- Greece: Star Channel
- Hungary: TV2
- Iceland: SkjárEinn
- Ireland: Sky1
- Israel: Channel 1
- Italy: Rai Due
- Japan: Sci Fi Channel
- Kosovo: RTV 21
- Latin America: AXN, beginning on August 28, 2006, occupying a Lost time slot between seasons 2 and 3.
- Macedonia: Sitel
- Malaysia: NTV7
- México: AXN, beginning on August 28, 2006, occupying a Lost time slot between seasons 2 and 3.
- Netherlands: Veronica, beginning January 7, 2008. Plays 2 episodes every Monday.
- New Zealand: TV3, beginning November 30, 2007.
- Norway: TV2
- Philippines: RPN 9 / C/S 9
- Poland: TV4, Polsat, AXN
- Portugal: MOV beginning 22 January 2013.
- Québec: Ztélé, French version beginning on January 1, 2007, under the title Threshold: premier contact.
- Romania: PrimaTV
- Russia: TV3
- Serbia: RTS1
- Slovakia: TV JOJ
- Spain: Telecinco
- Sweden: TV4 Plus
- Thailand: True Series
- Turkey: Digiturk(Dizimax)
- United Kingdom: Sky1 (repeated on Sky2 and Sky3), Sci Fi Channel
- USA: CBS, (repeated on Universal HD)
Read more about this topic: Threshold (TV Series)