The Arrowverse’s"Crisis on Infinite Earths"just gave us one of helluva DC crossover.
The two runners came face to face in S.T.A.R.
“Is this cosplay?

Clay Enos/Warner Bros. Pictures/DC Comics; Dean Buscher/The CW
Do you want a selfie, bro?”
Of course, that’s the last thing Barry wants or needs.
“This shouldn’t be possible now,” said Gustin/Barry, marveling at the situation.

Ezra Miller as the Flash in ‘Justice League’.Clay Enos/Warner Bros. Pictures/DC Comics
But before Gustin/Barry could explain what he meant, Miller/Barry started to fade away.
Miller isn’t the only face from DC’s movies to appear in the crossover.
Robert Wuhl, who starred in 1989’sBatman, had a brief cameo in the first hour of the crossover.