Heroes United

"Heroes United" is the first annual Avengerverse crossover event, broadcast on NBC, featuring episodes of the television series Thor, Iron Man, and Spider-Man. The event began on February 24, 2014, with the Thor episode "Introduction", continuing the next day with the Iron Man episode "Second Act" and concluded on February 26 with the Spider-Man episode "Conclusion". The crossover sees Amora, the Enchantress sending her Masters of Evil to wreak havoc upon New York City, forcing Thor to team up with New York's other heroes, Iron Man and Spider-Man, to stop their enemies.

A crossover between Iron Man and Spider-Man was announced to be in development in October 2012, leading up to the premiere of Spider-Man. However, creative choices by both shows pushed the crossover to the following season, so that Thor could be included. By the following December, the scripts for each episode had been written, with filming occurring shortly before the end of the month and into January 2014. The crossover sees every main cast member of each series who appear at least in their own series, with additional actors and characters also reprising their Avengerverse roles.

The episodes received positive reviews, with critics calling the crossover fun, and everything fans could have wanted and more. Critics praised the producers for bringing the two series together while keeping with each series' own storylines. Ratings for the episodes were exceptional, with Iron Man and Spider-Man posting season highs. Two subsequent crossovers occurred the following year titled "Stars and Stripes" and "Invasion".

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 * Note: Despite being credited, Alden Ehrenreich and Dallas Roberts do not appear in the Spider-Man episode.