I've held off on posting about this because I wanted to attempt making art for it first, but that'll just wait for another day.
Basically, Captain and Engineer Mark are the only ones to remember the Wormhole Incident. Obviously, this is distressing by itself, but the two can't simply 'hide' the weight of what happened to them, and they also attempt to sneakily probe others to see if they remember anything too.
No one does, and they grow increasingly concerned about this as gossip starts making rounds and concerned glances start reaching a peak. Eventually, they're wrapped into a medical evaluation, diagnosed with cryo psychosis, and it's reported to their higher-ups.
"Cryo psychosis" is a rare phenomenon associated with malfunctioning cryopods, and upon further investigation, it's confirmed that the two pods Captain and Mark were assigned to were the only ones to have malfunctioned this way. (C.C. is shaking her fist at Mark for 'fucking up Captain's brain' because he's such a stupid engineer. Her words.)
Given the specifics of Captain's position, they're deemed no longer fit to continue their duties, and the same goes for Mark (who gets replaced by Mack, perhaps? But like a non-tyrannical version). They're both essentially put on an extended medical leave and given a welfare plan, as well as regular citizenship on the new planet.
Both bond over being stuck with the memories of what really happened. Sometimes they agonize and wonder if it's all in their head after all, if everyone's right to think what they experienced wasn't real, but they're unable to let go of the truth of what happened to them. Because, in the end, whether it 'actually happened' or not, it doesn't change how they react and feel about it happening, or how the phantoms of those memories or delusions affect them long after the fact.
They grow old this way. It seems sad to be so isolated in that shared experience, for it to be so heavy that they only ever talk to each other about it, but they find happiness and live peaceful lives, with everyone on the new planet knowing exactly who they are and ready to be there for them in even the smallest ways.
They're never alone, not really, even with each other. This is a slice-of-life with a happy ending.