Crisis on Infinite Earths

Crisis on Infinite Earths is the name of the fifth annual shared multiverse crossover event between Supergirl, The Flash, Batwoman, Arrow, Black Lightning and DC's Legends of Tomorrow. The crossover aired over six nights.

Synopsis
With the annoucement of Crisis On Infinite Earths for Fall 2019, my mind just started churning with ideas on what can be done and the ultimate aftermath that can change the Arrowverse forever. This is real rough and brief. So Lets begin

SuperGirl: Crisis On Infinite Earths Part 1
The First scene we witness is the Monitor watching over all the different Earths in his dimension. Then the arrival of his counter-part The Anti-Monitor arrives and drains his energy leaving The Monitor weak. Monitor escapes but the Anti-Monitor begins his conquest of all reality. Meanwhile on Earth-38 Kara deals with technology going haywire and wierd disturbances. Somehow Brainey has been causing the techno disturbances and turns on Kara and the DEO. Brainey reports to Lex Luthor of Earth-11 (Smallville Universe). The Monitor arrives weaked and informs Kara of the Crisis that will destroy all realities. He uses some of his remaining abilities to pull Clark Kent from Earth-11 and Clark Kent from Earth-90 (Lois and Clark Universe) to help deal with the coming crisis. Kara gets Barry and Cisco from Earth-1 to help. Lex from Earth-11 links up with the Lex of Earth-38 to harvest the technology of Brainaic from both Earth's to create a new Brainaic (played by Smallville Brainaic). Clark from Earth-38 joins in to help stop the Brainaic but the Anti-Monitor reveals himself and says Earth-38 was a testing ground. Earth-1 will be the start of his conquest. Earth-11 and Earth-90 residents return to their reality to prepare while Kara, Barry, Cisco, Clark and Jon head to Earth-1 to mount a defense against The Anti-Monitor