'How I Met Your Mother' season 9 got back some much-needed good will with this past week's flashback-centric "Platonish," but will next Monday's "Mom and Dad" keep the streak alive? 'Dexter' vet John Lithgow returns as Barney's biological father Jerry, while the first clip from the all-new episode breaks out into song! Plus, will a series-long mystery finally be answered?

While it seems Barney has an aim to get his parents back together this week, his brother James appears to have had the same idea with his own biological father Sam (Ben Vereen) and Loretta ('American Horror Story' vet Frances Conroy). And when things get heated between Neil Patrick Harris and Wayne Brady, you know things had better break out into song!

Plus, while the promotional photos were sparse, one look at "Mom and Dad" suggests we might finally get an answer to a series-long mystery. No, not the mother, the pineapple! Here's what CBS had to say about "Mom and Dad":

BARNEY CONCOCTS A PLAN THAT WORRIES ROBIN, AND TED IS CONVINCED SOMEONE FRAMED HIM BY MESSING UP A WEDDING-RELATED DUTY, ON THE FINAL SEASON OF "HOW I MET YOUR MOTHER," MONDAY, NOV. 18

"Mom and Dad" — When Barney’s father arrives at the hotel, Barney devises a plan that makes Robin very nervous. Meanwhile, Ted is convinced someone framed him by messing up a wedding-related duty, on the final season of, HOW I MET YOUR MOTHER, Monday, Nov. 18 (8:00-8:30 PM, ET/PT) on the CBS Television Network. John Lithgow returns as Barney’s father, Jerry; Frances Conroy returns as Barney’s mother Loretta; and Wayne Brady returns as Barney’s brother, James.

Take a look at next week's 'How I Met Your Mother' musical extravaganza above and below, and give us your "Mom and Dad" predictions in the comments!

How I Met Your Mother Photos Mom and Dad John Lithgow
CBS
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How I Met Your Mother Photos Mom and Dad John Lithgow
CBS
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