'Til death do you part sounds all well and good, but what happens to a marriage if one of you can't die?

Netflix released the trailer for Season 3 of "Santa Clarita Diet," which sees realtor couple Sheila (Drew Barrymore) and Joel (Timothy Olyphant) confronting a previously undiscussed reality of her zombie-hood. Namely, she's immortal; he's not. But he could be, as she playfully points out: "We can spend eternity together — if you let me bite you."

But Joel has doubts. "It's not that I don't want to be with you. It's about what I might become."

The trailer ratchets up the comedic horror as well as the family issues of Joel and Sheila's relationship (and the one they have with their daughter). It also begins to introduce more mythology, as the mysterious Knights of Serbia seem to have their eye on Sheila.

"Santa Clarita Diet" Season 3 premieres March 29 on Netflix.