We first see him arrive in Storybrooke, Maine after crashing his car across the town line.
Since he is an “outsider”, everyone is worried he saw magic and will bring others to their city.
But turns out his real name was Owen Flynn, who arrived accidentally with his father as a boy. Regina wants to “adopt” him as her son (long before Henry’s birth), but the two regular people don’t feel right in this made-up town of magic. He ended up getting out of Storybrooke but he could never return. The memory of his father and revenge burning in his soul forever.
Until he finally achieves this goal with the help of his secret girlfriend Tamara. They want to destroy the source of all magic.
They think the key is bringing Henry Mills to Neverland, but they ended up being pawns of Peter Pan’s quest to regain his immortality.
And he’s taken out cold by Peter Pan’s shadow. Good riddance, I never had one ounce of respect for him.