Description via ABC.com:
Personal and professional relationships intensify, both aboard ship and on the ground, as the unseen power behind the mission begins to cause psychological and cellular transformations in the astronauts.
The mystery is still looming but has it got any clearer in the third episode of “Defying Gravity”?
**POSSIBLE SPOILERS AHEAD**
Click to Continue: Defying Gravity – Threshold Episode 3 Rundown