The Infinite was a spaceship that was forged during the Dark Times. It contained the heart's desire to anyone who discovered the ship. 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)