This offbeat Troi episode is reminiscent of Quantum Leap, with Troi (of all people) finding herself in the body of a "Darth Vader" like character. Marina Sirtis, proving she doesn't need her good looks to be interesting, is fantastic, as are Scott MacDonald and Carolyn Seymour as the two Romulans who, with Troi, form the tripod upon which the episode is built. The story is nicely laid out (even if the cargo is a MacGuffin) and it's refreshing to visit a Romulan ship and experience the culture from the inside for the first time since the original series episode "Balance of Terror". Sadly, the ending doesn't lead to any sequels, and thus the Romulas unification story (begun with the fifth season's "Unification) is left without resolution; at least for now
Deep Space Nine revisits this premise (featuring Kira) in their third season episode, "Second Skin", which is quite good in its own right.