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It doesn't matter if you're a rapper, a pirate, or an astronaut—everyone needs a good crew. While countless people step up to the plate to help Mark over the course of The Martian, no one puts as much on the lines as his five crewmates. With that in mind, we owe it to those dudes to get to know them a little better.
Allow us to introduce you to the posse:
And that's it, right?
Actually, we're leaving out the most important crewmember of them all—Commander Lewis. Besides her overwhelming (and slightly disturbing) obsession with disco, Lewis is defined by the immense guilt she feels over having "left him behind [...] in a barren, unreachable, godforsaken wasteland" (12.222). Although Mark tells her how much he respects her and her decision, she can't shake these overwhelming feelings of shame.
To be honest, though, this seriousness is exactly what makes her such a good leader. Commander Lewis would've given anything to be in Mark's place, and to sacrifice herself so her crew could live. We even learn that, on the day that Mark supposedly died, the crew "reluctantly obeyed Lewis's order" to "leave [her] behind" because she wanted to search more for Mark (12.111-113). Commander Lewis isn't just guilty that she left Mark for dead; she's guilty that she wasn't the one to make that sacrifice.
Ultimately, Commander Lewis realizes that the best way to make things right is by saving Mark. The rest of the crew wholeheartedly agrees. Although they're five different people with five very different personalities, they've all had their lives touched by Mark Watney in ways both big and small. It's only fair that they repay him for that—with interest.