Un equipo de expertos está montado después de la marina norteamericana descubre un objeto extraterrestre apareció brevemente cerca de un barco en el océano Atlántico.
Reparto de Operación Threshold
Listado de actores y actrices que aparecen
Agent Hargrave
Andrea Hatten
Agent Hayes
Libby Drennan
Agent Harper
Rachel
Karyn Reynolds
Detective
Richard Tate
Daphne Larson
Charlie Miller
Restaurant Owner
Candy Cane
Sergeant Adams
Capt. Hank Mancini
Dr. Margaret Johnson
Sheriff Fogel
Caretaker
Reverend Lavory
Dr. Urbassik
Ken Polchek
Cop
Stripclub Owner
Jordan Peters
Cindy
Kid
Mrs. Vasquez
Graham Bolton
Mr. Wheeler
Christine Polchek
Team Leader
Blue Collar Kid
Carl
Janice
Jason Bolton
Secretary
Patrick Drennan
Construction Worker
Assistant Manager
Davis
Danielle
Woodchipper Woman
Crewman Pena
Giggling Woman
Susan Medrano
Marcus
Daniel Park
Navy Seal #2
Young Girl
Guard #1
Darryl Brown
Chef
Grady
Ryan
Natalie
Clerk
Jen
Cabbie
Victoria Rossi
Chief of Naval Operations
Navy Pilot
Sam Blake
Military Official
Senator Will Tollman
Eddie
Medic
Chinese Woman
Hispanic Woman
Javier Fernandez
Maria
Seminar Goer
Nicky Frost
Jake Greene
Orderly
Robert Sprague
David Arroyo
Uniform #1
Condo Woman
Fry
Tattooed Street Thug
Ngotho
Dancer
Norm
Screaming Harry
Janet Tam
Tazz
Navy Seal #1
Philip Choi
Patient
Daughter
Threshold Agent
Woman in Bed
FBI Agent
Secret Agent
Bat-Winged Rave Girl
Officer Morris
Medical Tech
Nurse
Mercenary
Misty
Shirtless Alien
Panicky Businessman
Darga
Episodios de Operación Threshold
Arboles de cristal I
Arboles de cristal II
Sangre de niños
El incendio
Choque
Pulso
La orden
Revelaciones
Progenie
Brote
Brote
El vigilante
Alienville (FINAL)