Like "Amok Time" from the original series, this episode finally gives Trek fans an in depth look at a culture they've hungered to see more of. "Sins of the Father" visits the Klingon homeworld, redefining the aliens and setting in motion events that would influence Star Trek for many years to come. It's a landmark, memorable episode that's on most fans' "must see" lists for this series.
Naturally, it's a Worf story, and it features a breakout performance by Michael Dorn, who finally gets a handle on his character. But writer Ron Moore also uses Picard nicely, placing the Captain in a foreign culture and having him walk the fine line between being Worf's Cha'DIch (making Worf his superior) while also still being the Captain, in command and responsible for Worf and the Federation. Featuring some great guest stars (notably, Tony Todd and Charles Cooper), this episode serves as the first part of a four part story arc, with the next chapter being the fourth season episode "Reunion". Unfortunately, the episode starts a bit slow, meandering for a while before getting into the meat of the story. However, when the episode begins picking up momentum, it's Star Trek at its best.