GURPS Prime Directive allows players to play any type character, also allows cross-genre moves to be made, and includes limited elements of the Traveller Universe.

After the folding of Task Force Games and the cancellation of the original Prime Directive line, Amarillo Design Bureau, Inc., the new publishers of Star Fleet Universe games, were left with the question of what to do with PD.

[1] Eventually, they approached Steve Jackson Games to use the Powered by GURPS format.

[3]: 118  Amarillo Design Bureau continued publication of Prime Directive books for the GURPS, d20, and d20 Modern game systems.

Additional books produced as a subseries of PD include: This role-playing game related article is a stub.