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This story continued from Superman #15 and continued in Supergirl #16.
This story continued from Superman #15 and continued in Supergirl #16.
The assault on the Fortress of Solitude begins, with Superboy, Batman and Wonder Woman fighting in through the front door to get the shard of kryptonite; Superman and Cyborg trying to use Boom Tubes to get to H’el; and Flash vibrating through the wall to get to Supergirl. But once inside, Superman is teleported away to another dimension while protecting Superboy. Superboy feels guilty, so he follows Superman into the unknown.