Haha, well I hadn't gotten into it yet, but I was thinking that maybe they have multiple alien instructors, like a sci-fi Hogwarts :p and one of the instructors feels bad about the project and invasion, and he or she is the one that helps the protagonists escape to warn Earth. There are also the other "students" they will all be unwitting aliens that are being experimented on with the humans.
Haha, well I hadn't gotten into it yet, but I was thinking that maybe they have multiple alien instructors, like a sci-fi Hogwarts :p and one of the instructors feels bad about the project and invasion, and he or she is the one that helps the protagonists escape to warn Earth. There are also the other "students" they will all be unwitting aliens that are being experimented on with the humans.