VIDEO: First Look - Andrew Rannells, Cristin Milioti on Next HOW I MET YOUR MOTHER

Tony nominated Broadway stars Andrew Rannells (Book of Mormon) and Cristin Milioti (Once) will appear on the next episode of CBS's How I Met Your Mother titled 'Bass Player Wanted.' Milioti was cast in the pivotal role of 'The Mother' on the long-running hit comedy and is featured as a series regular in the final season of the show.

Get a first look below!

In the episode, the gang encounters a guy at the wedding who intentionally stirs up trouble among them, and Marshall finally arrives at the Farhampton Inn. The episode airs Monday, Dec. 16 (8:00-8:30 PM, ET/PT) on the CBS Television Network.

HOW I MET YOUR MOTHER, now in its ninth and final season, is a comedy about Ted and how he fell in love. This season takes place over the course of Barney and Robin's wedding weekend, when the lives of the gang change dramatically. Ted is about to move to Chicago, Marshall and Lily are about to move to Rome, and Robin and Barney are about to become husband and wife. The series is narrated through flashbacks from the future.