a. dilithium crystals
The job of keeping the ship's engine running falls to Chief Engineer Montgomery Scott. He's played in the rebooted Star Trek movie series by Simon Pegg, who was born on Feb. 14, 1970.
In the original TV series, James Doohan played Scotty.
The new version of the Star Trek crew will return to action this May. The latest sequel is called "Star Trek Into Darkness" and it features a mysterious villain played by Benedict Cumberbatch.