The mission was going ok until they had to fight into the asteroid belt of a unknown planet. Lance had been exhausted from hours of his own extra training(queue self-doubt cliche). Lance had slipped up and was hit into the planets atmosphere and crash landed on the planets dry, desert like surface.
Within a few hours, he realize the planet had an day and night cycle similar to Earth. It had been 2 days and he had learned many thing. He discover that the atmosphere had provide food, water, and energy. At first he thought it was nice without dealing with normal human functions but soon learned it was a dreadful curse. There where small translucent creatures that were peaceful and hospitable while there was light was present. When it was night there was no moon to reflect light onto the planet so it was complete darkness. Those creature would morph into the viewers worst fears and since there was no sleeping, he would relive his worst nightmares every night. In the day they would be the most affection things and be always at his side. Every time they emotionally cut into his skin they would patch it up haphazardly and leave a scar.
He dealt with this for two years. He spent it drowning in self depreciation and feeling of uselessness. If only he had spent more time training he wouldn’t have crashed. If only he had learned more engineering and how to repair Blue he would have been able to get him self out of here. If only he hadn’t been so useless. Every night he had been rejected by Keith and called disgusting and unnatural, he had been told by Pidge that he was an idiot and should have never even be accepted into the Garrison, Hunk would telling him he couldn’t even take a hint that he didn’t want to be his friend, Shiro would yell at him and play favorites and blame him for the team mistakes, and Allura would yell at him to get it together and stay focus because the universe was more important than you and that he need get over because they couldn’t form Voltron because off him.
At first he tried to ignore them or turn it into a joke but slow he started to believe it. He would spend full days training and studying from Altean books in the storage compartment with the help of Blue. It made him feel useful, distracted from the emotion Gremlins, and He learn how to fix the coms and signaled them to rescue him. It took them 91 days to get him which made him feel even worse how low of a priority could he be.
When the team was questioning Lance they had notice quite a few things different. He was more muscular, had a hardened look on his face, and spoke only when spoken too. They didn’t think much of it after all how much could change in only two hours.
(I had to do math so if the proportions are wrong pls tell me also it might look weird because I’m on my phone)