[s4e13] The Joining: Part 2 Official

The robotic alien hive-mind known as has launched a full-scale attack on Earth. While Martian Manhunter (J'onn J'onzz) warns of the threat, Batman initially tries to stop the invasion alone to protect Batgirl and Robin from danger.

The sound of the Joining's weaponry is an homage to the 1953 film War of the Worlds . [S4E13] The Joining: Part 2

During the invasion, even Gotham's villains—including The Joker, Penguin, Bane, and Mr. Freeze —fight alongside the GCPD to defend their city. The robotic alien hive-mind known as has launched

" The Joining: Part 2 " is the season finale of The Batman (2004) Season 4, originally airing on May 5, 2007. The episode concludes the high-stakes alien invasion arc and marks Batman's official transition from a solo vigilante to a member of the Justice League. The episode concludes the high-stakes alien invasion arc

Batman and J'onn attempt to infiltrate Wayne Industries to use its satellites to disrupt the Joining's signal.