From the Casting Brief:
A seasoned combat veteran with the self-possessed strength of a born leader.
When the family's spaceship crash-lands on an unknown planet, he maintains a goal-oriented attitude.
We see he and his wife draw together in this emergency, but the truth of their relationship is they’re estranged.
John insisted that he come along to protect his family from the unknown dangers they might face.
This is a chance to make up for the mistakes he’s made in the past, and earn a place back in the family.
Faced with difficult decisions that test even him, John must face one potential disaster after another (most of them involve trying to find the lesser evil)