Be afraid. Be very afraid. The onslaught of horror television series is growing — and growing — to the point it’s now hard to believe there was a time when networks shied away from the genre.

This week brought us the new season of AMC’s zombie hit, “The Walking Dead,” as well as FX’s second round of Ryan Murphy’s “American Horror Story.” In case you’ve been living under a rock, “AHS: Asylum” has Jessica Lange as a real twisted sister — a sadistic nun presiding over a 1960s insane asylum where torture and other horrible, disgusting, depraved and demented things happen.

And there’s more, much more. A&E is preparing to bring us “Bates Motel,” a prequel to Alfred Hitchcock’s horror classic, “Psycho” — and yes, it’s a series. Freddie Highmore (so adorable as young Charlie in “Charlie and the Chocolate Factory” with Johnny Depp!) plays the young Norman Bates.