Deep Space Nine's third series begins eventfully, with Sisko promoted to captain and being gifted a prototype warship equipped with a cloaking device, while Odo learns where he came from. In the two-part opening tale, this clever gambit is played to hook viewers into the idea of DS9 becoming an ongoing mystery/conflict show. Why the sudden intense format tweaking? Mostly this was to ensure the show continued to thrive when a really rather greedy production hierarchy fast-tracked Voyager onto the air mid-season (cue unnecessary crossover episode with Tuvok). Of greater concern was ratings thief Babylon 5, which played its counter-Trek cards at precisely the right time. Fortunately the result (initially at least) was a genuine boost for DS9.