Hellstorm Fireball

Hellstorm Fireball engines were high technology devices used in space cruisers. Nostalgia Tours converted a space cruiser with a Hellstorm Fireball engine to give it the appearance of a 1950s tour bus. When it crashed into a satellite the Quarb crystal powering the engine was damaged and Murray accidentally broke the Doctor's replacement. He managed to grow another one in 24 hours with the TARDIS' thermo-booster and the engine was repaired. As it prepared to take off the bus was destroyed by the Bannermen. (DW: Delta and the Bannermen)