What was the crisis in and how did characters begin to solve problem?

The crisis was that the aliens had invaded Earth and were quickly taking over. The humans were outnumbered and outgunned, and it seemed like all hope was lost.

However, a group of brave heroes emerged who were determined to fight back against the aliens. They used their unique skills and talents to come up with creative solutions to the problems they faced. For example, they used their knowledge of physics to create a sonic weapon that could disable the alien ships, and they used their knowledge of biology to create a serum that could make the humans immune to the alien's weapons.

By working together and using their collective knowledge, the heroes were able to eventually defeat the aliens and save Earth.