For over a week now we've been getting those little 10 second previews of the Supergirl and The Flash crossover. Well as expected, tonight we finally get the 30-second promo! This was shown at the end of tonight's new episode and it looks to offer us the fun and delight we all thought when we first heard Supergirl and Flash would share the screen. There are some heavy events coming in the next two Supergirl episodes after this, so the light-hearted Barry Allen seems like he is perfectly placed! Check out the preview below:
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