For Dave Franco and Alison Brie, the real-life married couple who star in the horrifying “Together,” it’s never been more true to say, “The family that stays together, really, really stays

Not to say this film doesn’t require them to stretch or act, but the base credibility established by that off-screen fact goes a long way in selling the wild things that transpire down the line.

Dave Franco and Alison Brie have made the midnight movie of the year. At January’s Sundance Film Festival, no selection was more raucously received than Together, a body-horror thriller about a relationship that gives new meaning to the term co-dependent.