Oliver Queen's biggest challenge yet is on the horizon. Arrow Season 8 will send the Green Arrow on a mission to save the multiverse.
According to the official Season 8 logline,
Oliver will find himself pit against his most challenging battle yet, one that will leave the multiverse hanging in the balance. In Arrow’s final season, Oliver Queen is forced to confront the reality of what it means to be a hero.
In the Season 7 finale, the Monitor appeared at Oliver Queen and Felicity Smoak's safehouse. He told Oliver to make good on his end of their deal from "Elseworlds," informing him that they would travel to other worlds to warn of the upcoming Crisis. Worse, he revealed Oliver would die in the conflict to come.
As such, it appears Oliver will spend his final, 10-episode season building up to the Arrowverse's five-show crossover "Crisis on Infinite Earths." Seeing as Season 8's conflict "will leave the multiverse hanging in the balance," this further suggests that at least part of the season will be spent on alternate earths.
Unfortunately, the logline does not offer any clues about the rest of Team Arrow's whereabouts. However, if the season ender was any indication, they will likely continue to fight for Starling City.
Returning Tuesday, October 15 at 9 p.m. ET/PT on The CW, Arrow stars Stephen Amell as Oliver Queen, David Ramsey as John Diggle, Rick Gonzalez as Wild Dog, Juliana Harkavy as Black Canary, Colton Haynes as Arsenal and Katie Cassidy as Black Siren.