Ultra Beasts are mysterious and powerful creatures from the Pokémon universe, introduced in the games Pokémon Sun and Pokémon Moon. They originate from a dimension known as the Ultra Wormhole and are often considered to be extraterrestrial in nature. Each Ultra Beast has unique abilities and designs, making them distinct from regular Pokémon. In the games, players can encounter Ultra Beasts as part of special events or missions. They are categorized by a letter designation, such as Nihilego (UB-01) and Kartana (UB-04). Ultra Beasts play a significant role in the storyline, often linked to the Ultra Recon Squad and the lore of the Alola region.