Crisis on Infinite Earth

Crisis on Infinite Earths"

To prepare for the coming Crisis, the Monitor recruits Oliver Queen and sends him on missions to collect items,[3] brings J'onn J'onzz's brother Malefic to Earth-38,[4] and retrieves the dead body of Lex Luthor.[5] Barry Allen and Iris West-Allen learn that the Crisis date has moved up to December 2019, and that in order to save billions, the Flash must die.[6] Barry travels to Earth-3 to see Jay Garrick and Joan Williams, who have been tracking anti-matter appearing across the multiverse. They send Barry's mind forward in time, causing him to see billions of timelines where the multiverse is destroyed and the one where he dies saving it.[7]

Meanwhile, the Monitor sends Oliver to Earth-2 to retrieve dwarf star particles, where he witnesses the alternate Earth's destruction from an anti-matter wave.As he returns to Earth-1, the Monitor diverts him to Hong Kong to retrieve biophysicist Robert Wong, who has recreated the Alpha-Omega virus, and place him in A.R.G.U.S. custody.[9] Back in Star City, William Clayton, Connor Hawke, and Mia Smoak mysteriously time travel from 2040 to the present.[10] Oliver and John Diggle eventually learn that Lyla Michaels has been working with the Monitor. The Monitor places Oliver and Laurel Lance in a shared time loop, allowing Laurel to properly say goodbye to Quentin Lance and Oliver to accept he cannot change his fate. Out of the loop, the duo find themselves on the island Lian Yu along with Diggle, William, Connor, and Mia for their final mission.[12] As the island has become a hotspot for supernatural activity, William uses all the parts and knowledge gathered from their previous missions to build a weapon for the Monitor, which can only be activated with Lyla's DNA. Once she touches it, she is powered by the island's energy and disappears into one of the Monitor's portals.[13]

The Monitor visits Earth-38 to contact J'onn, telling him he has passed his test after saving Malefic and is ready for the Crisis. Back in his realm, he notifies a now revived Lex that his mind is needed for the coming Crisis.[14] Minutes before the Crisis is to begin, Nash Wells, a doppelgänger of Harrison Wells, is sucked into the Monitor's chamber under Central City after being promised a new life.[14] At the start of Crisis, red skies loom over Central City and Lian Yu. Lyla returns to the island to collect Oliver and Mia, telling them she is now a "Harbinger of things to come.

Cast and characters
Further information: Supergirl, Batwoman, The Flash, Arrow, and Legends of Tomorrow cast and characters

Main and recurring
{| class="wikitable plainrowheaders" ! rowspan="2" |Actor ! rowspan="2" |Character ! colspan="5" |Episode !Supergirl !Batwoman !The Flash !Arrow !Legends of Tomorrow !Melissa Benoist[16] !Chyler Leigh[16] !Katie McGrath[16] !Jesse Rath[16] ! rowspan="2" |LaMonica Garrett[19][20] !David Harewood[16] !Ruby Rose[24] !Grant Gustin[24] ! rowspan="2" |Stephen Amell[25] !Cody Christian ! rowspan="2" |Brandon Routh[27][28] (from Superman Returns) !Caity Lotz[30] !Katherine McNamara !Tyler Hoechlin[27] !Candice Patton[22] !Bitsie Tullock !Jon Cryer[34] !Danielle Panabaker[22] !Carlos Valdes[22] !Hartley Sawyer[18] ! rowspan="3" |Tom Cavanagh[36][37] !David Ramsey[24] !Audrey Marie Anderson
 * Kara Danvers / Kara Zor-El / Supergirl
 * Main
 * colspan="2" |Guest[17][18]
 * colspan="2" |Guest
 * Alex Danvers
 * Main
 * colspan="4" |TBA
 * Lena Luthor
 * Main
 * colspan="4" |TBA
 * Querl "Brainy" Dox / Brainiac 5
 * Main
 * colspan="4" |TBA
 * Mar Novu / Monitor
 * colspan="2" |Main[21][17]
 * rowspan="2" |Main[22][18]
 * colspan="2" |Main[23]
 * Anti-Monitor
 * colspan="2" |TBA
 * colspan="2" |TBA
 * colspan="2" |TBA
 * J'onn J'onzz / Martian Manhunter
 * Main
 * colspan="4" |TBA
 * Kate Kane / Batwoman
 * Guest[16]
 * Main
 * Guest[18]
 * colspan="2" |TBA
 * Barry Allen / Flash
 * Guest[16]
 * Guest
 * Main
 * colspan="2" |TBA
 * Oliver Queen / Green Arrow
 * Guest[16]
 * Guest
 * Guest[22]
 * Main
 * TBA
 * Multiple versions of Oliver Queen
 * colspan="5" |TBA
 * colspan="5" |TBA
 * Tiberius Queen/The Shield
 * colspan="2" |Guest[16][17]
 * Guest
 * Main
 * TBA
 * Ray Palmer / Atom
 * Guest[16]
 * rowspan="2" |Guest[17][29]
 * colspan="2" |Guest
 * Main
 * Clark Kent / Superman
 * Clark Kent / Superman
 * Guest[18]
 * colspan="2" |TBA
 * colspan="2" |TBA
 * Sara Lance
 * colspan="2" |Guest[16][17]
 * colspan="2" |Guest
 * Main
 * Mia Smoak
 * colspan="4" |Guest[16][29][32]
 * TBA
 * Clark Kent / Superman
 * colspan="3" |Guest[16][29][18]
 * colspan="2" |TBA
 * Iris West-Allen
 * TBA
 * Guest[29]
 * Main
 * colspan="2" |TBA
 * Lois Lane
 * Guest
 * Guest[17]
 * colspan="2" |TBA
 * Main
 * Lex Luthor
 * TBA
 * colspan="3" |Guest[17][18][35]
 * TBA
 * Caitlin Snow / Frost
 * colspan="2" |TBA
 * Main
 * colspan="2" |TBA
 * Cisco Ramon
 * colspan="2" |TBA
 * Main
 * colspan="2" |TBA
 * Ralph Dibny / Elongated Man
 * colspan="2" |TBA
 * Main
 * colspan="2" |TBA
 * Nash Wells
 * colspan="5" |TBA
 * Pariah
 * colspan="2" |TBA
 * Main[22]
 * colspan="2" |TBA
 * Eobard Thawne / Reverse-Flash
 * colspan="5" |TBA
 * Eobard Thawne / Reverse-Flash
 * colspan="5" |TBA
 * John Diggle / Spartan
 * colspan="2" |TBA
 * Guest[22]
 * Main
 * Guest

Lyla Michaels / Harbinger
! !Osric Chau[38] !Katie Cassidy[40][41] !Matt Ryan[42]
 * colspan="2" |Guest
 * Guest[22]
 * colspan="2" |TBA
 * Mick Rory / Heat Wave
 * colspan="3" |TBA
 * Main
 * TBA
 * Ryan Choi
 * colspan="3" |Guest
 * TBA
 * TBA
 * Laurel Lance / Black Canary (Earth-1)
 * colspan="3" |
 * Main
 * TBA
 * John Constantine
 * colspan="4" |TBA
 * Main
 * }