Tokyo, 1961 is a scenario that appeared in SimCity. In the scenario, Tokyo was under attack by a monster.
The monster that invades the city is a monster based on Godzilla, a Japanese dakaiju (giant monster) that made his debut in Ishiro Honda's 1954 film, Godzilla. He would later go on to star in 28 more films until Godzilla: Final Wars 2004. A remake was released in 2014.
If the player have the SNES version of the game, the city will be invaded by Bowser Koopa from the Mario series instead.