Things will get really interesting when "Bones" returns with the penultimate episode on May 12 and Booth and Brennan explore the world of drag.

In the upcoming episode, which is titled "The Drama in the Queen," the Jeffersonian crew will investigate the death of a college swim coach named Brian Thomas whose remains were discovered at the bottom of a well. Initially, Brennan and Sweets believe that Brian may have been having an affair, however, through their investigation they will discover that he lived a secret life as a drag queen, reports Hollywood Hills.

According to E! News, before Thomas died he offered Booth information on a possible government cover-up of a previous case. However, when the team digs deeper, Booth will find himself in way over his head, which could signal that these could be his last days with the FBI.

In the meantime, "Sweets will meet and be intrigued by a new intern" played by "The Big Bang Theory" actress Laura Spencer, said executive producer Stephen Nathan, according to TVLine. Nathan added that the Jeffersonian team will be "visiting the world of drag queens, which is a first for us and for our team." The EP also told TVLine that Spencer's character is "a great addition to our rotating interns." 

According to CarterMatt.com, the synopsis for "The Drama in the Queen" states:

"The Jeffersonian team investigates the death of Brian Thomas, the head swim coach at a community college, whose remains were found dumped at the bottom of a well. When possible suspects tell Brennan and Sweets that Brian may have been having an affair, the team digs a little deeper only to find details of Brian's secret life. Meanwhile, Sweets fills in for Booth in the investigation while Booth prepares to testify before a Congressional subcommittee and the Jeffersonian team gets a new intern (guest star Laura Spencer) who catches Sweets' attention."

Along with Laura Spencer, a few of the other actors will make a guest appearance in the Episode 9.23, including Alix Elizabeth Gitter as Jillian Rice, Emily Montague playing Gabby Morrell and Shawn Ryan as Destiny Childs/Lloyd Egan, reports TV Guide.

"Bones" S9E23, "The Drama in the Queen," airs Monday, May 12 at 8 p.m. EDT on Fox.

Watch a preview below.