Jonathan Frakes came back to Star Trek in Star Trek: Deep Space Nine Season 3's "Defiant," and the episode made Thomas Riker the point of the story. Frakes was not revisiting Will Riker here. He was playing the transporter duplicate who had split off years earlier and now returned with a very different life behind him.
That is why the episode keeps drawing attention: it folds a familiar face into a different series, then hands him a role that belongs to Thomas rather than Will. For readers chasing why "Defiant" keeps coming up in conversations about Star Trek, the answer is that it gives Frakes a sharper turn than a simple cameo. It is a crossover built around the version of Riker that fans first met in TNG Season 6's "Second Chances," when the Enterprise returned to Nervala IV and revealed a transporter duplicate of Will Riker stranded there for eight years.
From there, the character's path diverged. Thomas Riker later accepted a posting on a different vessel and went by Thomas, and "Defiant" makes clear that this is not just an echo of Will's story. He is revealed as one of the Maquis, a group formed in response to attacks on Federation colonies by the Cardassians and willing to use terrorism against them. That choice also put him in violation of Starfleet's treaty with the Cardassians, which gives the episode a harder edge than a routine return appearance.
The friction is what makes "Defiant" more interesting than a clean reunion. Thomas Riker was created in a Star Trek: The Next Generation episode that was mostly about Will Riker, but the later Deep Space Nine outing treats him as the character with the real stake in the room. That shift matters because the show was airing while producers were working on Star Trek: Voyager, and the franchise was still sorting out how its characters could move between series without losing the thread of who they were. Ro Laren had already pointed in that direction on TNG with the Maquis, and "Defiant" pushes the idea further by making Thomas's divided loyalty the point.
Frakes' return therefore lands as more than nostalgia. It is the moment Thomas Riker stops being a one-episode duplicate and becomes a figure with his own loyalties, his own name and his own fallout. The unanswered part is not whether he matters; the episode settles that quickly. It is what happened in those eight years on Nervala IV that made the Maquis feel like his answer.
