And no, its Tribblations...(checking startrek.com) Tribble-ations to be absolutely correct.
Its the DS9 episode where physically-altered Klingon agent Arne Darvin steals the Bajorean Orb of Time and attempts to alter history, by killing Captain Kirk before he determines that loads of grain (quadrotritikale, sp?), has been poisoned in order to allow Klingons to gain control of Sherman's Planet.
It was the DS9 attempt to pull a 'Han-meets-Jabba-remake'. The took the footage from TOS "Trouble with Tribbles" and added the DS9 cast.
- We meet Temporal Agents Dulmer and Lucsly (anagrams of Mulder and Scully), who are part of a Starfleet agency that monitors the timeline.
- We learn that the lack of head ridges on Klingons is "not something they like to talk about with outsiders".
- Doctor Bashir gets put in a strange situation, as he meets a woman on the Enterprise that he thinks is his now young and attractive grandmother (and he never knew who his grandfather was). He speculates that he is his own grandfather, and that not 'engaging' his grandmother, he will then cease to exist. Chief O'Brian talks him out of that.
Season 5, Episode 6