Arrow Season 5: 10 Big Questions That Need Answering
3. Who Is Prometheus?
The Big Bad of Season 5, Prometheus is the sort of villain that calls back to the early days of Arrow; there's no magic here, just well-honed fighting skills, weaponry, and a vendetta against the Green Arrow.
The character will tie directly into the season's theme of legacy, and be a result of Oliver's actions as the Hood in Season 1 - having spent the time since then training for a showdown with his nemesis in order to get his revenge.
So who is he? He could ostensibly be a brand new character, but the notion of him tying into Season 1 suggests that he'll be someone we've come across before (Tommy Merlyn is the big fan theory), or at least connected to someone we saw killed off in that first season - which doesn't narrow it down all that much.