Bob, I think you are thinking about the DS9 episode titled Trials and Tribble-ations wherein the Defiant is sent back in time and space to where to the events of the Original Series episode The Trouble With Tribbles. They did a lot of great remastering and insertions, particularly with the bar-fight scene. (^_^)
EDIT: which reminds me, Jadzia Dax wearing the old women's Starfleet Duty Uniform, self-introducing with the words, "And women wore less." RAWR!
EDIT: which reminds me, Jadzia Dax wearing the old women's Starfleet Duty Uniform, self-introducing with the words, "And women wore less." RAWR!