When does Threshold return?

The series stars Carla Gugino as Dr. Molly Caffrey, a high-level government crisis management consultant. The series focuses on a secret government project investigating the first contact with an extraterrestrial species. One night, the crew of a U.S. naval vessel encounters a UFO and the Threshold protocol is activated. The aliens are attempting to rewrite the DNA of the human race using an audio signal that somehow alters some people's body chemistry in such a way that they become alien themselves.