It was the shark. The one Battle Star Galactica gradually jumped when it let politics take it off the rails.
The extent of the show’s political and ideological corruption is best exemplified by the fact that one of the central pillars of the series had to be yanked: the notion that the Cylons had a grand, complex, conspiratorial plan involving their human doppelgängers that was unfolding inexorably over the course of the show’s run, one that humans needed to uncover in order to secure a victory in the war for the survival of their species. Indeed, every episode of the first three seasons began with an opening sequence in which the viewer is explicitly told that the Cylons “have a plan.” But in the third season, a Cylon leader explains that “plans change,” whereupon the Cylon quest to exterminate the human race simply evaporates so the show can riff on the evils of “occupation.” By the premiere of the fourth season, the Cylon plan was no longer mentioned during the opening credits. And every other seed of plot that had been planted over the previous years was left untended and forgotten as well.
The miniseries and first season are some of the best television ever done. The first half of the second season is pretty good. By the third season it was clear that the earlier claim, “they had a plan” was a lie.
I never watched the fourth season.