How better to make a shocking arrival in an alternative world than by meeting your own self and knocking him out with a taser? Well, thats exactly what Barry Allen did. With the Scarlet Speedster thinking of ways to track down Zoom, it soon becomes clear that even in this alternative world hes still a CSI. As such, he takes the place of his other self in an attempt to get access to CCPDs systems in order to try and locate Zoom and Harry Wells daughter. It was great to see two Barrys side-by-side on screen, even if the Earth-2 Barry couldnt help but gush like a fanboy at the sight of Harrison Wells. Ever the science nerd, clearly.