James Doohan remains Scotty to "Star Trek" fans, who looked to his son to carry on the legacy. Here's how Christopher Doohan got his seat on the Enterprise.

There was a time when Khan Noonien Singh was one of the many one-off villains in Star Trek: The Original Series, with Ricardo Montalbán having played him in the 1967 episode “Space Seed.” Then ...

Khan filled in the last remaining questions about Khan Noonien Singh, and it's time for Star Trek to put Khan to rest.

First aired late in Season 1, “Space Seed” introduces Khan Noonien Singh, a genetically engineered tyrant from Earth’s past, who is found in stasis and quickly tries to take over the Enterprise.