On Arrow, Oliver Queen is on a mission for the Monitor. 1 / 8
On The Flash, Barry Allen is facing the doom of Crisis on Infinite Earths. 2 / 8
Both series are slowly building to the upcoming Arrowverse event. 3 / 8
And now, the two series' next episodes will be extremely similar. 4 / 8
The promo for Arrow shows Oliver trapped in an alternate reality by the Monitor. 5 / 8
Similarly, Barry will fight Bloodwork in a warped reality. 6 / 8
Both characters are facing similar trials meant to prepare them for the coming Crisis. 7 / 8
Crisis on Infinite Earths kicks off Sunday Dec. 8 on Supergirl. 8 / 8