Cell (セル Seru) is the ultimate creation of Doctor Gero, former chief scientist of the Red Ribbon Army, to get revenge on Goku. He is an artificial life form created using the cells of several characters from the series, including Goku, Piccolo and Freeza. As a result, Cell is able to perform techniques such as the Kamehameha, which he gains from the cells of Goku. Cell evolves several times throughout his appearances; he originally evolves from a cicada-like form into his Imperfect form, which is still insect-like in appearance. Both his first form and his second Semi-Perfect form have a long tail that ends in a stinger-like appendage and allows it to absorb other organisms. The tail recedes under his wings in his final Perfect form, and he can use it to spawn Cell Juniors, minuscule childlike versions of himself. Requiring the androids #17 and #18 to evolve, he finds out that they are already dead in his timeline, so he kills the Trunks of his timeline and uses Trunks’ time machine to travel back in time. He eventually absorbs both after many battles and ascends to his perfect form.He decides to hold the Cell Games (セルゲーム Seru Gēmu), a tournament in which he fights against Earth’s strongest fighters. Cell manages to defeat Goku, but he is eventually killed by Gohan.