This week's episode of "Grey's Anatomy" season 12 will start a "hot and steamy hook-up." Titled "Old Time Rock and Roll," the installment will see Maggie all flustered as she wakes up in her room to Andrew, the handsome Grey Sloan intern, putting his clothes on.

When she becomes conscious of what happened, Maggie rushes him to head off the place before anyone sees him. Unfortunately, Amelia sees him getting out of Maggie's room, realizing that the two shared the night together.

As teased in the trailer for the "Grey's Anatomy" season 12 episode, things quickly went from "inappropriate to downright awkward." Maggie won't talk to Andrew. She hides when he passes by and uses Meredith as a shield, a wall and messenger when he needs to communicate with him.

It seems that Maggie feels bad about hooking up with an intern. The promo shows her asking Meredith "Who does that? Who screws the intern?" with her replying, "The father of my children," referring to McDreamy, who fell for Meredith when she was just an intern there.

In the same "Grey's Anatomy" season 12 episode, viewers will also see Arizona mull over giving romance another chance. This is after her patient, who happens to be a 90-year-old, assured her that she will still "find love."

It remains to be seen if love for Arizona still includes Callie. Many fans want to see them together while others think they are better off with someone else. What's understood though is that the former lovers may still have some feelings left for each other.

Meanwhile, Owen tries to figure out a way for interns to learn how to break bad news to the families of patients, which is very difficult to do. In the same installment, viewers will see Meredith and her sisters' display their forgetfulness by being unable to recall they are the host of the dinner party.

"Grey's Anatomy" season 12 episode 4 airs Oct.15, 8pm ET on ABC.