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The second installment of the final season of “Titans,” which was split into two six-episode parts, has finally arrived on HBO Max. Two new episodes are now available on the streamer, which will release episodes on a weekly basis until the series finale on May 13.

The superhero team-up series follows young heroes from across the DC Universe as they come of age and find where they belong. In the third season, circumstances draw the heroes to Gotham City, where they reunite with old friends and face new threats. The first half of Season 4 left off with a cliffhanging mid-season finale, in which Sebastian Sanger (Joseph Morgan) agrees to take part in a cultish ritual that leads him to unwittingly vaporize most of the surrounding Titans, a scene that is...