Decay follows several students that discover that the maintenance crew of the Large Hadron Collider have been transformed into zombies after the particle accelerator malfunctions. The students must try to evade the zombies while running through CERN's maintenance tunnels.
- Zoë Hatherell.....Amy
- Tom Procter.....Connor
- Stewart Martin-Haugh.....James
- Sara Mahmoud.....Kate
- William P. Martin.....Matt
- Eduard Friesen.....Director General