Pulse

Kristen Bell

Mattie

Ian Somerhalder

Dexter

Christina Milian

Isabelle Fuentes

Rick Gonzalez

Stone

Jonathan Tucker

Josh

Samm Levine

Tim

Octavia Spencer

Landlady

Ron Rifkin

Dr. Waterson

Joseph Gatt

Dark Figure

Kel O'Neill

Douglas Zieglar

Zach Grenier

Professor Cardiff

Riki Lindhome

Janelle

John Burke

Newscaster

Mike J. Regan

Phantom

Steve Tom

Male Newscaster #2

Brad Dourif

Thin Bookish Guy

Christine Barger

Goth Girl

Di Quon

Christina

Moira Price

Sarah

Robert Clotworthy

Calvin

Tate Hanyok

Cafe Girl (uncredited)

Julie Lancaster

Female Newscaster (uncredited)

Grant George

U.S. Army Emergency Broadcaster

Tobey Maguire

Tristan Hartson