WATCHMEN 9 p.m. on HBO. Damon Lindelof has suggested that the season finale of “Watchmen,” his adaptation of the influential comic, could also wrap up the series, telling The Hollywood Reporter that he and his writing team “plotted these nine episodes with every mystery and question being resolved.” Either way, the fate of Dr. Manhattan (and the future of his powers) hangs in the balance, while the threat of white supremacy and the Seventh Kavalry rages on.

RICK AND MORTY 11:30 p.m. on Adult Swim. Fans of Justin Roiland and Dan Harmon’s animated sci-fi series waited years for Season 4. Now, after five short episodes, the season will take a hiatus and pick back up in 2020. Until then, catch Morty and his mad scientist grandpa, Rick, take one last adventure through the multiverse in 2019, after spending this season battling dating apps, a dragon and death itself.