From The TV IV
- My name is Molly Caffrey, and I work for the Federal Government. I deal in worst case scenarios, the unthinkable. On September 16th, 2005, the unthinkable happened. An extraterrestrial object appeared off the bow of a naval freighter. The entire crew was exposed to a high frequency signal. Some died instantly. Others began to change. They are now stronger, more resilient. They dream of alien landscapes. And they are driven by the impulse to infect others. Several of the crewmen are now loose in the United States. They will strike anytime, anyplace, anyone. Their goal: to turn us into them. But I have a plan to stop them. That plan is called "Threshold".
Threshold along with The Ghost Whisperer was CBS's answer to Lost for the Fall 2005 season. An alien ship finds its way to Earth, while here they infect the crew of a US Navy vessel. Dr. Molly Anne Caffrey heads up the government team created to assess the danger of invasion. Alien Terror Alert: Yellow!
| Season || Premiere || Finale || #
| Season One || September 16, 2005 || November 22, 2005 || 13