[Charles Martel]

Yes, they were very restrained in updating the interior shots when they did the digitally remastered episodes a few years ago. Mostly some close-ups of instruments were tweaked - like the digital chronometer changed to look like LCDs instead of gear-driven drums with digits, (had to have been originally based on an auto odometer of the '60s).

A full-blown refurbishment of the entire series would be prohibitively expensive - but it'd be interesting to let various FX studios compete by updating certain space-battle episodes, such as "Balance of Terror" or "Elaan of Troyius".

[TwelveOfTwenty]

The digital remake of “The Doomsday Machine” is one of the best. The modern CGI took that episode to a whole new level.