You can't spoiler an episode with the payoff in the title. The journey is the point here. Whether you enjoy it is entirely down to your tolerance for graphic animated torture porn.
But given the oeuvre, why else would you be watching?
Let's be clear that this is essentially a very offbeat Rick and Morty episode in terms of writing, tone, animation, and voicing by Justin Roiland. There's more to it though, with a great supporting vocal cast, including Christian Slater who gives a better performance here than in the pedestrian Inside Job. The weak point is perhaps Asjha Cooper who is competent but not truly compelling. Another sad result of identity casting.
It's not complicated, it's not even hugely clever or inventive beyond the mostly useless teen supes, but it rocks along at a great pace and delivers on the premise.