sentences:  Android #17 is activated by Dr. Gero after Gero fails to terminate Goku.#18 is activated a short time after, and the group of androids are discovered by the heroes, Dr. Gero ordering #17 and #18 to terminate them while Android #17 remains passive until killing Gero.After surviving a full power attack from Trunks, the androids activate #16 and begin a quest to find Goku out of pure entertainment, being confronted by Vegeta who begins a duel with #18.