The Martian crew debates how to save the life of one of their own.
A joint mission brings about conflict between crew members.
After a sudden crisis, the Martian crews pull together.
As NASA scrambles to prepare for the launch to Mars, Margo is confronted with a harsh personal reality.
Nearly 10 years have passed. Danielle and Ed attend a celebration, where things take a terrifying turn.
Eight years later, a new mission begins: Capture an asteroid. Aleida and Danielle are still haunted by events from the past.
Puck, Quinn, Santana, Mercedes, Brittany, Artie and Tina all return to McKinley for Homecoming and help Rachel and Kurt recruit for the new glee club.
