Before Hades was captured and sent to the Isle of the Lost, he found about his future demise from the Fates five years before it would occur.
With this Knowledge, Hades had a child with his most trusted and loyal servant, Cerberus.
Thus, Conway was born.
Sent to the Isle at a young age, Conway learns to fend for himself after the loss of his father's sanity, and soon, someone else.
Now 20 years later, he is sent to Auradon with Mal, Carlos, Evie and Jay. Unlike the others, he is sent to teach Auradonian's about the Isle's conditions.
"The name's, Hadey, Princess of The Underworld. How ya doing?"
When Mal, Hadey, Evie, Carlos, and Jay are sent to Auradon by a proclamation from the soon-to-be-king, it's up to the five teens to steal the Fairy Godmother's wand and release the villains from their prison.
It's a lot easier said then done, and that's the gospel truth.