Sacrifices will be made and both universes may never be the same again after Walter and Olivia visit the "other side."
Episode rating
Cast of episode
64
28
7
- Olivia Dunham
- Dr. Walter Bishop
- Peter Bishop
- Charlie Francis
- Astrid Farnsworth
- Phillip Broyles
- Nina Sharp
- Dr. William Bell
- Store Owner
- Attendant
- Major Warner
- Nurse 2
- Nurse 3
- Nurse