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Oliver traveled to Earth 2 in the Arrow season premiere. 1 / 7
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He's working with the Monitor to collect dwarf star particles. 2 / 7
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He was supposed to avoid getting entangled in the events of that world, but he was distracted by doppelgangers of his friends. 3 / 7
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He even helped prevent a version of "The Underaking" from Arrow's first season from being conducted by Earth-2's Dark Archer, Tommy Merlin. 4 / 7
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His deviation from the plan may have alerted the Anti-Monitor, who destroyed all of Earth-2 with anti-matter. 5 / 7
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Oliver hasn't traveled to any other Earths since, but he'll want to pay more heed to the Monitor's warnings if he does again. 6 / 7
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The Crisis crossover is almost here and Oliver's actions could impact the fate of the entire universe (or at the very least, himself and his friends) 7 / 7
Screen Rant
