Great Ape (CookieKid247)

The Great Ape, or Oozaru, is a giant monkey-like creature Saiyans can transform into by looking at the moon. In order for the transformation to take place, the Saiyan needs to have a tail, as the glands responsible for initiating the transformation are located exclusively there. He also needs to absorb at least 17 million zeno units of Bruits ("Fruits") Rays (called "Blutz Waves" in the English dub and Green-spectrum Radiation in the English manga) through his eyes, to initiate a transformation. Bruits waves are found only in sunlight reflected by a moon. If there is no moon, a planetary body will reflect the same amount of rays. The easiest way to achieve this is to gaze at the full moon, making Saiyans similar to werewolves in this aspect. If any clouds covered the moon and/or a planetary body, it would block certain amounts of the radiation. Vegeta once made himself transform by firing a "fake moon" reflecting the requisite amount of Bruits Rays into the air, then staring at it. A device on board the Saiyan Attack Pods also project a hologram of a moon that was realistic enough to allow Blutz Waves to be reflected in the event of their landing on a planet that lacks a moon, as evidenced by an incident where Gohan went Great Ape while training for fighting the Saiyans prior to their invasion due to Goku's attack pod reactivating