I thought in DS9 O'Brien had been replaced by a version of himself that was literally explosive which, I further thought, was the reason that they could not simply arrest him or take some other measure. But I do not believe the replicant in this episode is in fact explosive.
If he is not explosive but would like maybe assassinate someone via conventional means, is it possible there is another episode with maybe even a different character who has been replaced by an explosive version.
Or is there a completely different, non-Star Trek story with an explosive replicant?
NOTE: Bill Goldman who wrote most famously The Princess Bride and Butch Cassidy and the Sundance Kid wrote IIRC a sequel to Marathon Man which was called Brothers -- the Brothers referred to ambiguously two replicant little kids, they acted completely like humans except... they were explosive.
So look, basically everyone is explosive -- but not O'Brien???