It was a challenge being a “Game of Thrones” fan during the last season. But the Thronies have had it a lot easier than the Eve-ies, the fans of “Killing Eve,” the BBC America and AMC series that wraps season 2 on Sunday at 8 p.m. At least “Game of Thrones” is over; “Killing Eve” has only just begun.

I can’t remember the last time I watched a good show go down the tubes so quickly — maybe “Heroes,” or “Glee,” or “Prison Break.” After a thoroughly entertaining and clever first season, “Killing Eve” has succumbed to self-parody. Maybe it’s because writer Phoebe Waller-Bridge didn’t return for the second round; maybe it’s because the cat-and-mouse concept didn’t have enough substance to hold up.


What seemed meant as an undercurrent in season 1 — Eve’s deep attraction to the danger represented by Villanelle — has become awkwardly explicit. And while I generally enjoy Sandra Oh, she doesn’t make Eve’s obsession quite believable. So Villanelle murdered her dear friend, a fellow agent, and yet there she is, in bed beside the killer because of some mysterious fascination.

The only reason I haven’t given up is Jodie Comer, who is endlessly fun to watch. Her bratty boredom and her ability to change accents and attitudes instantly are magical, so much so that at times she makes me think of Tatiana Maslany in “Orphan Black.”

Matthew Gilbert can be reached at gilbert@globe.com. Follow him on Twitter @MatthewGilbert.