Prime Directive is an alternate version of the Star Trek universe, starting from the time of the original series but diverging from the official timeline of the TV series and films. Essentially it's a separate game license from those given to do RPGs based on the official stuff. It grew out of a combat game called
Star Fleet Battles. There have actually been quite a few products published for it, under its original system rules and the GURPS system.
It would certainly be cool if the PD publisher got a license from Hero Games to do a HERO version, and I know that Darren and Steve and Co. are pretty reasonable about terms, so it's certainly possible. kehrer1701, have you heard anything about steps being taken to do this?
In the meantime, though, your fellow HEROphiles have stepped in to fill the gaps.

On the website below you'll find detailed HERO character conversion notes and profession/race packages for the First Edition of
Prime Directive, plus examples and guidelines for gaming in the Star Fleet Universe:
http://www.seenar.com/games/primedirective/prime.html
On this website you can download PDFs of comprehensive campaign sourcebooks for the Original Series and Next Generation/ DS9:
http://www.starherofandom.com/h_trekhero/index.php
Between them (and the HERO rules) you'd have just about everything you'd need to campaign in the world of Prime Directive.
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