"Crisis on Infinite Earths, Part 4" Promo Pics

Here are the official stills for the second-to-last episode of this winter's Arrowverse crossover.

"Crisis on Infinite Earths, Part 3" Clips

Here are a pair of clips from tonight's episode of the Arrowverse crossover.

UPDATE: another one

Osric Chau Cast in "Crisis on Infinite Earths"

According to TV Insider, Osric Chau has landed the role of Ryan Choi in the upcoming Arrowverse crossover. In the comics, Choi is the new Atom, taking over for Ray Palmer (who is leaving Legends of Tomorrow this season). The official description for the show's version of the character reads,

physics professor at Ivy Town University... a normal guy who learns that he has a pivotal role to play in the coming crisis on infinite earths

Photo credit: Gage Skidmore