[s4e13] The Joining: Part 2 -

Encouraged by Alfred, Batgirl and Robin disobey Batman’s orders to stay behind and join the fight, eventually holding off robots while Batman hacks the system.

Upon arriving at the Watchtower, Batman reveals he had already hacked the League’s systems months prior as a "precaution". If you'd like, I can: Detail the Justice League's powers shown in the show. Compare this version of the Justice League to other series. Provide a summary of the Season 5 follow-up , "Lost Heroes." Which of these The Joining, Part 2 | The Batman (2004) Wiki | Fandom [S4E13] The Joining: Part 2

" 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. Encouraged by Alfred, Batgirl and Robin disobey Batman’s

The sound of the Joining's weaponry is an homage to the 1953 film War of the Worlds . Compare this version of the Justice League to other series

The episode ends with Batman joining J'onn on the Watchtower space station, where he meets other heroes: Green Lantern, The Flash, Hawkman, and Green Arrow .