20 years ago - 3-year-old Owen is taken by child services & placed in foster care.
3 years ago - 20-year-old Owen is found by his father Digger Harkness. They begin spending time together.
2 years ago - 21-year-old Owen's father Digger Harkness dies. He takes up his father's role as Captain Boomerang & joins the Rogues.
Owen Mercer was introduced in the pages of Identity Crisis after the death of the original Captain Boomerang. He was a great design and seemed to immediately be set of for great things within the DC universe.
Unfortunately, there were only a few places where a character poised so fantastically between hero and villain could thrive. The Outsiders were an obvious choice and he showed up on their one-year-later transitional team, but that was shut down with the arrival of Batman's new team. Given the legacy of the original Captain Boomerang in the Suicide Squad, you'd think they would have gone straight there, but unfortunately the team lineup at the time was largely forgettable. He got most of his appearances in the pages of Supergirl, where he simply served as her best guy-friend.
We went straight for the role he's clearly meant for... serving in the Suicide Squad.