Atop Wayne Industries, the Joining robots attack Batman and J'onn while the alien ships spread out across the platform. Batman blows a hole in the roof and escapes downward with Lucius, while J'onn holds off the robots long enough for them to escape in the Batmobile. Batgirl and Robin are waiting in the Batcave when Batman returns and informs them of what's going on. Batman tries to analyze the anti-gravity problem while the replicant Lucius head informs them that the Joining cannot be defeated...Read the full recap
Green Arrow, the Flash, Green Lantern, and Hawkman make cameo non-speaking appearances at the end of the episode.
Along with the Joker, Bane, the Penguin, and Mr. Freeze are seen in non-speaking roles fighting the Joining.
Batgirl: How are you so calm, Alfred? Aliens! I think that would warrant at least one of your signature cocked eyebrows.
Alfred: I keep house for a man who dresses like a bat and works in a cave. At this point in my life, there’s little that phases me.