Assuming you are looking for the content of the episode, S02E15 was a monumental moment for the Arrowverse (or whatever remains of it on The CW).

As the episode begins, the primary Earth and the are in the final stages of merging, a process orchestrated by a super-powered Ally Allston. This "World War Bizarre" causes people and objects to phase randomly between realities, creating a sense of apocalyptic panic. The stakes are personal for the heroes:

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The core of this episode revolves around Lois and Clark’s desperate race to save Jonathan from the irreversible effects of the "Inverse Method" he used to get X-Kryptonite out of his system. The body horror here is subtle but effective. Jonathan’s veins turning black? Chilling. Jordan’s guilt? Palpable. This episode finally gives Jonathan (Jordan Elsass) the dramatic meat he has deserved all season. He isn’t just the "normal" twin anymore; he is a ticking time bomb.

Air Date: June 21, 2022