CBR

In the midseason finale of Batwoman, The Flash's Nash Wells made a surprise guest appearance... 1 / 16

...that may very well have kick-started the "Crisis on Infinite Earths" crossover event. 2 / 16

After the devastating events of the midseason finale, Batwoman smash-cut to Central City. 3 / 16

In a tunnel deep beneath the city, Nash discovered a metal door with strange symbols on it. 4 / 16

A timestamp revealed a jump to Dec. 9 at 11:58 pm, the day the Batwoman installment of the crossover is slated to air. 5 / 16

"For so many years, I've traveled across worlds, across the multiverse, to do one thing: kill you," he whispered. 6 / 16

"And now we're here. You saved my life." 7 / 16

"And now we're here. You saved my life." 8 / 16

A disembodied voice responded. "Submit, and begin your life anew," it boomed. 9 / 16

Nash tapped the symbols in a certain order, causing the door to open. 10 / 16

A white light enveloped him and dragged him forward, then the door slammed shut after him. 11 / 16

Teaser text promised the story will continue in "Crisis on Infinite Earths." 12 / 16

If Marv Wolfman and George Pérez's Crisis on Infinite Earths is any indicator, it probably isn't the Monitor behind that door. 13 / 16

Nash may have just released the Anti-Monitor into the Arrowverse, which could transform him into Pariah. 14 / 16

The Flash is due to sacrifice his life on Dec. 10, which is shortly after this flash-forward takes place. 15 / 16

Batwoman will return in "Crisis on Infinite Earths," which begins Sunday, Dec. 8 at 8 p.m. ET/PT. 16 / 16