The CW has released a preview sneak-peek video from episode 1 of the 3-part “Elseworlds” crossover event.
The special 3-night “Elseworlds” crossover event will begin in “The Flash” on Sunday, December 9 at 8.00pm ET, and then continue in “Arrow” on Monday, December 10 at 8.00pm ET, and will conclude with “Supergirl” on Tuesday, December 11 at 8.00pm ET.

Is it just me or is Oliver acting a bit like Barry? His mannerisms seem to mimic Barry’s a bit to me. So my question is, since they switched lives, will they also inherit their personalities over time if they are not switched back? Will they actually believe that they are this new version of themselves if they are not switched back in time?