Crisis on Infinite Earths Part 3 left the Arrowverse decimated - but could Harbinger and Pariah partner up to redeem themselves and undo it?

Who is Harbinger, the agent of the Monitor at the center of Crisis on Infinite Earths and how has her arrival been planned since Arrow season 1?

Crisis on Infinite Earths, The CW's upcoming Arrowverse crossover, will see Audrey Marie Anderson's Lyla Michaels suit up as Harbinger.

Paramount has acquired the rights to the Harbinger movie and more Valiant brands from Sony, dividing this universe from Sony's Bloodshot film.