Montgomery Scott, the Starfleet engineer better known as Scotty, solved countless problems aboard the USS Enterprise. He also solved a big problem for "Star Trek" itself. Whenever the action on the Enterprise's bridge threatened to get repetitive, the show could cut to James Doohan's Scotty working in the engine room for a change of scenery. When "Star Trek" creator Gene Roddenberry first envisioned the sci-fi series, which originally aired on NBC, he didn't expect to make the Enterprise's chief engineer a major character. If you're on the bridge, we can cut to the engine room, where something is always going on.'"