NAMCO x CAPCOM
This is not the first time Namco and Capcom have made a game together as they released a Japan-only crossover game in 2005 for the PlayStation 2 titled "Namco × Capcom". However, this game consisted of characters outside of the "Street Fighter" universe as well as the "Tekken" universe and instead included various characters from Capcom and ones from Namco (like the "Darkstalkers" and "Soulcalibur" series, for example), and at least two characters exclusive to the game. "Namco × Capcom" was a role playing game, thus making "Tekken X Street Fighter" and "Street Fighter X Tekken" the first games in the fighting game genre to be made by Namco and Capcom.