On Peter Quill's 13th birthday, Chitauri warriors attack the Quill household, kidnapping Peter and killing his mother Meredith. Many years later, Peter becomes a mercenary named Star-Lord and leads the Guardians of the Galaxy. In order to make money, the Guardians head into the forbidden Quarantine Zone, established by the Nova Corps to store debris from the war to capture a rare monster for their patron, Lady Hellbender. However, they are forced to flee the Quarantine Zone when Peter picks up a yellow gem and accidentally releases an unidentified alien entity.