The Best Worf Episodes Of Star Trek

In "Parallels," an episode from the final season of "TNG," Worf returns to the Enterprise from a bat'leth tournament and becomes unsettled by increasingly strange occurrences. Decorations in his quarters shift around, the guest list of the surprise birthday party he's dreading keeps changing, and, most shockingly of all, he learns Counselor Troi thinks they're a romantic couple. 

We eventually learn that on his way back from the tournament, Worf unintentionally piloted his shuttlecraft through a quantum fissure, which is causing him to shift through different realities. We see this reflected from scene to scene, and sometimes even from shot to shot. Decorations all over the ship change, different characters hold different positions, and in one case, Worf discovers Wesley Crusher still serving aboard the Enterprise, even though he hasn't been seen on the show since two seasons previous. 

"Parallels" give us a lot of fun alternate reality shots of the Enterprise crew, including a grizzly-bearded Will Riker from a universe where the Borg are the dominant lifeforms. But beyond that, of all the best Worf-centric episodes, "Parallels" is one of the few that doesn't revolve around Worf's inner struggles as a Klingon.