Entertainment Weeklys Jonathon Dornbush praised the scene where Barry talks to his Earth-2 doppelgänger's mother over phone, saying Gustin "has proved mightily adept at tackling Barry's grief, hope, and the many other emotions swirling around in regard to his mother and her death." Scott Von Doviak of The A.V. Club said, the episode "jump-starts both the [Zoom] storyline and the season as a whole" and concluded, "this is just about as good as The Flash gets." Ed Gross of Empire rated the episode four stars out of five, saying, "The Flash may hit an occasional speed bump (sorry) along the way, but it pretty consistently delivers the goods. Welcome To Earth-2 is a perfect example." Charlie Hall of Polygon gave the episode a mixed review and despite complimenting the premise, said, "it eventually devolved into the same storyline we keep seeing over and over again. It's another instance of Allen's impulsiveness getting the better of him."
