Complete story — includes the ending
Mar Novu / The Monitor sends Oliver Queen to Earth-2 to retrieve Dwarf Star particles, but they are stolen by this Earth's Tommy Merlyn as the Dark Archer who is looking to use them to level the Glades with his own version of the "Undertaking" in order to avenge Earth-2's Thea. Oliver joins forces with Earth-1 John Diggle as well as Earth-2's Laurel Lance and Adrian Chase to stop Tommy and retrieve the particles. Just as Oliver and Diggle are about to leave, an anti-matter wave suddenly consumes all of Earth-2, barely giving them and Laurel time to escape to Earth-1. In the 2040 flashforwards, Connor Hawke, Mia Smoak, William Clayton, and Zoe Ramirez encounter the Deathstroke Gang, led by Connor's adoptive brother John "J.J." Diggle Jr., who have grown more powerful ever since the destruction of the wall between Star City and the Glades and the defeat of Galaxy One.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Arrow season 8. HTML formatting and reference markers removed. · Content license