(NOTE TO EDITORS: The following episodes of THRESHOLD have been substituted for the ones previously scheduled for the dates indicated.)

WHEN THE BIG HORN SIGNAL IS HEARD AT A MIAMI RAVE, MOLLY AND THE TEAM MUST HUNT DOWN THE SOURCE, ON "THRESHOLD," FRIDAY, OCT. 14

"Pulse" -- When it's suspected that the Big Horn signal has infiltrated a rave in Miami, Molly and the Red Team must track down who has been affected and find the source before it spreads to the masses, on THRESHOLD, Friday, Oct. 14 (9:00-10:00 PM, ET/PT) on CBS. Bill Norton directed the episode written by Mike Sussman. (Previously scheduled for an earlier date)

After it's discovered that the signal from the Big Horn made its way into a music mix at a Miami rave, Molly and the team head to Florida to investigate if any of the partygoers have been infected by the exposure and to track down the rave's DJ, Karyn Reynolds (Amanda Fuller), who has gone missing after exhibiting some bizarre behavior. Once they realize that Reynolds is the one who has been infected and has the potential to spread the signal to the mass population, they must find her to prevent a potentially catastrophic situation.

Dr. Molly Anne Caffrey: Carla Gugino
J.T. Baylock: Charles S. Dutton
Cavennaugh: Brian Van Holt
Dr. Nigel Fenway: Brent Spiner
Lucas Pegg: Rob Benedict
Arthur Ramsey: Peter Dinklage
Karyn Reynolds: Amanda Fuller
Marcus: Kevin Alejandro
Javier Fernandez: Gonzalo Menendez
Ngotho: Lahmard Tate
Sid Reynolds: Rob Swanson
Ryan: Adam Chambers
Tanned hottie: Paula Miranda
Officer #1: Michael A. Bentt
Hispanic woman: Irina Maleeva
Clerk: Ewan Chung
Jen: Erin Cummings

RATING: To Be Announced