The Infinite was a spaceship that was forged during the Dark Times. According to the legend, whoever discovered the ship would find their heart's desire. Three data chips were needed to find its secret location. Captain Kaliko, Ulysees Meregrass and Gurney had the three chips. Baltazar was also after the chips, and murdered the chip carriers to get to the ship. He also used the Doctor and Martha Jones to get the location. He discovered the lost ship in the end, but the Infinite was destroyed by the Doctor. (DW: The Infinite Quest)