After a few run-ins with Loke, Lucy Heartfilia finally finds out the truth behind him: he is actually the Celestial Spirit Leo the Lion. She uncovers that his previous owner was a famous Celestial Spirit Mage, Karen Lilica, and after her death he was unable to return to the Celestial Spirit World. Lucy offers to save him, but Loke informs her that she can't because he himself killed Karen and broke the fundamental rule between man and spirit. (Source: Fairy Tail Wiki)

Aired on: 5/23/2010