An unannounced visitor at the Francis home rattles Betty.

That's the only tease AMC would give regarding this Sunday's new episode of Mad Men, as the show is known for remaining tight-lipped about all spoilers. But the network has at least released a clip from "Hands and Knees," which we've published here:

[video url="http://www.tvfanatic.com/videos/hands-and-knees-clip/" title="Hands and Knees Clip"][/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.