“Fringe” (9 p.m ., Fox): Every show, it seems, wants to do a musical episode. Now,

“Fringe” (9 p.m ., Fox): Every show, it seems, wants to do a musical episode. Now, “Fringe” takes a page from “Buffy the Vampire Slayer” and “Scrubs” with a tale that has Walter going on a self-medicating binge. Naturally, lots of singing and dancing break out in his twisted mind.

TV listings, B6