Android 18 is a character from the anime Dragon Ball Z. She is actually a cyborg, with cybernetic parts grafted on her by the mad scientist Doctor Gero. At first she was determined to kill Goku, but realizing that she had no reason to kill Goku, she decided to spare Goku's life and become a heroine. She also fell in love with Krillin, and the two married soon after. She is an expert martial artist and can channel the mystical force known as ki into energy attacks. Her cybernetic limbs give her super-strength, super-speed and invulnerability.