Question: In what Star Trek episode did Worf travel back to the time of the original "The Trouble with Tribbles?" Angelina, Masawa, Aomori, Japan
Televisionary: Well, just to be specific for the folks at home, Angelina those not as well versed in the Trek universe need a little hand holding, after all allow me to point out that you're talking about Star Trek: Deep Space Nine, the syndicated show that was produced from 1992 to 1999.
In the November 1996 episode "Trials and Tribble-ations," Sisko, Dax, Odo, Worf, O'Brien, and Bashir travel back in time to track down the Klingon spy nabbed by Capt. Kirk (William Shatner) and crew on the original series before the spy can take revenge and prevent his own capture. As fans know, they failed, Kirk was killed and all episodes and shows that took place after the original Tribbles episode ceased to exist, costing Paramount untold millions.
(Okay, not really. Had you for a second, though, didn't I?)