Megara sold her soul to Hades in order to save her boyfriend's life, but instead he repayed her by running away with another woman, and leaving Meg in the possession of the god of the Underworld. Meg is thus determined to never fall in love with anyone ever again. Hades uses her as a main device in his plot to defeat Hercules, and offers to give her freedom in return for finding out Hercules' weakness. She finds herself falling in love with Hercules instead, though she doesn’t want to admit it, and tells Hades that Hercules has no weakness.
Hades eventually realises that Meg is actually Hercules' weakness. He strikes a deal with Hercules; to give up his strength for 24 hours, with the promise that a chained Meg will be safe. Hercules agrees, as Hades spitefully reveals that Meg was working for him all along. His heart broken, Hercules loses the will to fight the Cyclops Hades turns upon him. Determined to help and save her love, Meg finds Pegasus and finds Phil, persuading him to come back and help Hercules regain his confidence once again.
After Hercules manages to defeat the Cyclops using his wits, Meg sees a pillar collapsing and pushes Hercules out of the way. Instead, she gets crushed by the pillar. Meg got hurt, which breaks Hades' contract. Hercules also regains his strength once again, and Meg finally admits her love for Hercules. Hercules makes a promise to Meg that she will be okay, and leaves her in Phil's care while he goes to stop Hades taking over Mount Olympus.
After saving Olympus, Hercules races back to be with Meg, but arrives seconds after she died. Hercules then makes a trip to the Underworld, and rescues her soul, which brings her back to life and makes him a True Hero. Meg and Hercules then travel to the gates of Olympus where Meg watches Hercules enter the gates. Being mortal, she cannot follow. However, Hercules realizes that he wants to be with Meg, and gives up his chance to be a god on Mount Olympus in order to live a mortal life on Earth with her.