Ayalaan depicts the story of an alien who crash-lands on Earth. The alien meets Ayush Narayan (Sivakarthikeyan) and seeks help to return to his home planet.
However, things get complicated when Ayush Narayan accidentally travels to the alien's home planet and learns that the alien is a fugitive. He must now help the alien escape from the authorities on the alien's planet and find a way to get back to Earth.
