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The UFO is an unidentified flying saucer that originates from EarthBound. It is featured in the stage Fourside in Super Smash Bros. Melee and later in Super Smash Bros. Ultimate. The UFO randomly appears from the leftmost or rightmost side of Fourside, and serves as another platform for the fighters to fight on. The UFO has a very slippery surface, reducing traction for fighters. After a prolonged period of time, the UFO disappears, but returns to the stage after a period of time.