https://ew.com/tv/2019/08/04/cress-williams-black-lightning-arrowverse-crisis-on-infinite-earths
Characters from Black Lightning will make an appearance in the network’s forthcoming Arrowverse crossover “Crisis on Infinite Earths,” the network confirmed at the Television Critics Association summer press tour Sunday morning.
Black Lightning has been separate from the Arrowverse shows since it premiered in 2018, so this will be its first crossover with The CW’s other heroes. That being said, it’s worth noting that “Crisis” isn’t expanding to include a full Black Lightning hour. The massive five-hour event will still just include Arrow, The Flash, Supergirl, DC’s Legends of Tomorrow, and the forthcoming Batwoman.
Furthermore, Kevin Conroy, who famously voiced Batman on Batman: The Animated Series, will also make an appearance as Bruce Wayne from the future. Of course, Conroy previously voiced this role on Batman Beyond, which was set many years in the future and followed an elderly Bruce Wayne as he mentored a new Batman.
In addition to announcing those two castings, The CW also revealed when “Crisis on Infinite Earths” will begin with
Supergirl on Sunday, Dec 8; followed by Batwoman on Monday, Dec. 9 and The Flash on Tuesday, Dec. 10. Following the winter hiatus, the crossover will resume on Tuesday, Jan. 14 with Arrow at 8 p.m. and Legends of Tomorrow at 9:00 p.m.