Project X Zone

Project X Zone (プロジェクトクロスゾーン) is a crossover simulation RPG video game for Nintendo 3DS released on October 11, 2012 in Japan, and released in North America on June 2013 and Europe on July 5, 2013. The game features characters from Capcom, Sega and Namco Bandai.

X, Zero, Tron Bonne and the Servbots appear in the game as playable characters. Also in the game are Iris as an event character, and Vile, Armor Soldier, Mets, Gun Volt, Horokko, Red Horokko and Sharukurusu as enemies. Cyber Space appears only once as a stage for Chapter 20 and Kattelox Island's City Hall appears as background art for a brief cutscene.

X, Zero and Vile first appear in Chapter 20, appropriately titled "The Maverick Hunters" ("Irregular Hunter" in the Japanese version). X and Zero are actually the final new Pair Unit to join the team (Chris and Jill from the Resident Evil series officially join the party in the next chapter, but they had been properly introduced during the fifth prologue portion earlier). References to Sigma are made during X and Zero's initial conversation with Vile, but Sigma himself does not appear in the game.

Due to the game's crossover universe lore, KOS-MOS from the Xenosaga series apparently has information about X, Zero and the Maverick Hunters in her database. In turn, Zero has information about KOS-MOS, as well as Devilotte and Tron (though this interferes with the Mega Man series continuity as Tron would be born literally thousands of years later, therefore Zero should not know who Tron is at all and should not have data about her). Following the previous continuity of Namco x Capcom, Tron remembers KOS-MOS from their past cross-dimensional journey together. Though it's only self-contained lore, the timelines of Xenosaga and Mega Man Legends apparently align themselves with each other due to their science fiction themes, a fact originally established in Namco x Capcom.

A sequel, Project X Zone 2: Brave New World, has been released. X and Zero have been confirmed to return. During a video from E3 2015, it was shown that X and Zero were fighting Sigma, who appears in the sequel as well.

Cameos
Capcom
 * Devillote summons the Mobilesuits Alpha and Beta from Side Arms Hyper Dyne.

Sega
 * Ulala summons Harrier from Space Harrier, Opa-Opa from Fantasy Zone and Scooter from Alien Storm.