UFO

UFOs (Unidentified Flying Objects) or Flying Saucers are the basic means of transportation for aliens. UFOs are high-tech vehicles that can travel large distances in space. There are also many different kinds and shapes some look like saucers (hence the name) and others look like squares.

Super Mario series
Super Mario Galaxy contains many flying saucers, that appear mainly in Battlerock Galaxy and Dreadnought Galaxy, that Mario and Luigi can walk on. A crashed UFO floats on the, in Melty Molten Galaxy. Additionally, in the intro cutscene, Bowser calls a single UFO to dig the Princess Peach's Castle surroundings, before lifting it.

In certain levels of Super Mario 3D Land (such as world 1-3) where a pair of Binoculars are found, the player may be able to use them to spot a white UFO flying through the sky, although it eventually flies up and out of sight.

Mario Party series
In Mario Party Advance, Mr. E helps Fly Guy to call an UFO to the rooftop of Mushroom Condo.

In Mario Party 5, ID UFO presents various different shaped saucers, as the players must "identify" them.

UFOs appear in Mario Party 6 in the nighttime version of the minigame Freeze Frame. In this minigame, players can take pictures of UFOs, which are worth three points.

In the minigame Launch Break from Mario Party 9, an UFO can be briefly seen flying in the outer space. It has a cylindrical shape, and a yellow star placed on the top.

Super Mario Land series
In Super Mario Land, UFOs appear in Muda Kingdom, where they are seen above Mario in the start of each land level. Sunken UFOs are common in the underwater level from this world.