Threshold (2005) is a Sci-Fi & Fantasy, Drama, Action & Adventure series that follows 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. Threshold is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 7.0 out of 10 from 81 votes. Fans of sci-fi & fantasy series may also want to explore similar titles below.