- Jacob Soley - Alex
- Anna Arden - Alicia
- Jenny Raven - Irina Wong
- Charlotte McKinney - Girl on Bicycle
- Steve Byers - Marlo's Brother
- Lisa Codrington - Chief Resident
- Emily Piggford - Neurology Resident #1
- Martha Girvin - Neurology Resident #2
- Taylor Trowbridge - Lauren
- Nadine Whiteman - Paramedic #1
- Richard Young - The Dean's Secretary
- Mary Grant - Radiologist
- Stefano DiMatteo - Paramedic #2
- Jimi Shlag - Burly Patient
- Natasha Bromfield - ICU Nurse
- Daniela Barbosa - Hayley
- Brian King - Chemistry Teacher
- Jessica Rose - Puzzle Nurse
- Corey Chainey - Medical Student
- Janet Porter - E.R. Doctor
-
Niels Arden Oplev
-
Ben Ripley
- Angela Demo
- David Blackman
- Peter Safran
- Roisin McGilly
- Michael Douglas
- John Buchan
- Ryan Collins
- Nerses Gezalyan
- Peter Schultz
- David Giammarco
- Robin Harlan
- Larry Rench
Capítulo disponible en las siguientes plataformas: