User blog comment:Jamie/Episode 22 - The Flash Mid Season Review/@comment-166-20141230031130/@comment-1895174-20141230060444

Harrison Wells is an evil scientist from the future. Eddie Thawne is a cop who has a working relationship with Barry through the Central City PD.

Harrison Wells is Prof. Zoom, and Eddie is the show's Hunter Zolomon.

Didn't Dr. Wells say Barry needed to be protected for now when he stabbed Simon Stagg? The Flashpoint storyline was about Prof. Zoom finding a point in the past where he could kill Barry without erasing himself from existence. Seems like that's what's happening here. All we need is for Harrison Wells to reveal his real name is "Edward Thawne Jr." at some point. "Edward" isn't that far from "Eobard" I guess. What kind of name is "Eobard" anyway?

As for how Dr. Wells, Eddie, and the Reverse-Flash could all be in the room at the same time, maybe Harrison Wells went back in time more than once? Maybe there's a third Reverse-Flash? There is another Reverse-Flash in the comics, one whose appearance was always obscured? Maybe the other speedster Cisco theorizes was there when Barry's mom died is Jay Garrick?