Every season of Threshold ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Threshold!

Trees Made of Glass (1)

Trees Made of Glass (2)

Blood of the Children

The Burning

Shock

Pulse

The Order

Revelations

Progeny

The Crossing

Outbreak (a.k.a. Escalation)

Vigilante

Alienville

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.

The Best Seasons of Threshold

The Best Seasons of Threshold

Season 1