Arrow season 8 destroyed Earth-2 to kick off Crisis On Infinite Earths. 1 / 7
Oliver Queen went to Earth-2's Starling City to get dwarf star tech for The Monitor. 2 / 7
Oliver met many dead characters like his mother Moira, Tommy Merlyn, and Malcolm Merlyn. 3 / 7
Earth-2 was destroyed by an antimatter wave at the end of the episode. 4 / 7
The only survivor of Earth-2 we know of is Laurel Lance, the Black Canary. 5 / 7
Earth-2 was introduced in The Flash season 2. Harrison Wells, Jesse Quick, and Gorilla City likely all died! 6 / 7
The stakes for Crisis On Infinite Earths were hammered home by Earth-2's destruction. 7 / 7