See the promo for Monday’s How I Met Your Mother episode “Ring Up!” in which Pretty Little Liars‘ Ashley Benson guest stars as Carly.

This looks like a great way to bring back How I Met Your Mother after last week’s returning episode! Not only is Ted embarking on a new and awkward romance with young Carly (Barney’s sister, we have to assume), but there’ll be musical numbers?!

The episode description reads:

BARNEY BEGS TED TO CONTINUE SEEING HIS YOUNGER, WILDER GIRLFRIEND, EVEN THOUGH TED HAS NOTHING IN COMMON WITH HER, ON “HOW I MET YOUR MOTHER,” MONDAY, JAN. 21.

We’ve got a feeling that Barney will not be happy when he finds out that the girl he’s been begging Ted to sleep with turns out to be his estranged dad’s other child…

Are you excited to see this episode? Are you disappointed that Barney’s sister isn’t gonna end up being the mother after all?

And are there any Pretty Little Liars fans out there who’ll be watching this episode just to see Hannah in a different environment than usual?

How I Met Your Mother 8×14 “Ring Up!” airs Monday at 8/7c on CBS.

Don’t forget that you can discuss this show as well as all the other fandoms we cover over on the Hypable forums.