Arrowverse: 10 Implications From Crisis On Infinite Earths
8. John Diggle Becomes The Green Lantern
At the end of the Arrow series finale, John Diggle discovers a box from a strange meteor, which crash landed near his van as his family was preparing to leave to Metropolis following Lya’s promotion in Argus. As he picks up the box, a faint glow of green light appears and the scene ends. This confirms a popular fan theory that Diggle is somewhat linked to the Green Lantern.
The theory attained viral status when Earth 90 Flash revealed to Diggle that he was not wearing his ring; implying that Earth 90-John Diggle was indeed a Green Lantern. Diggle’s stepfather, Roy Stewart also made an appearance in Season 7 of Arrow.
One of the many new earths in the post Crisis-era was Earth 12, which featured a glimpse of Planet Oa, home to the Green Lantern Corps and Guardians of the Universe. It is likely that this new earth is where the HBO Max Green Lanterns TV Series takes place.