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During the course of the story, Goku encounters allies such as Bulma, Master Roshi, and Trunks, rivals such as Tien Shinhan, Piccolo, and Vegeta, and villains such as Frieza, Cell and Majin Buu. Goku's group of associates, known as the Dragon Team (ドラゴンチーム, Doragon Chīmu)[ch. 165], bolster its ranks throughout the series with the addition of former enemies and new heroes. The group is also known in Japanese as the Z Fighters (Z戦士, Zetto Senshi) or TEAM "Z" in other media, and in the English dub of Dragon Ball Z as the Earth's Special Forces. The series is well-known for reforming villains, as several of Goku's friends (nl: Piccolo, Vegeta, Android 18 and Majin Buu) were first introduced as serious villains. All four of those characters committed atrocious villainous acts: Piccolo is the spawn of the evil King Piccolo and shared his goals for ruling the Earth by any means necessary; Vegeta was the proud Saiyan prince who, under Frieza's orders, is directly responsible for killing thousands of innocent lives; 18 is a Cyborg designed by the leader of the Red Ribbon Army, Dr Gero, to be a killing machine alongside her twin brother Android 17; Majin Buu is a magical monster created by the evil wizard Bibidi and later resurrected by his son Babadi. The original Buu was a form of pure evil, but after absorbing a fat and kind-hearted Kai, he became more docile and child-like. In his fat-form he is still responsible for killing thousands of people.