“CSI’s” favorite leather-clad lady is back. Melinda Clarke reprises her role as dominatrix/sex therapist “Lady Heather” on tonight’s wild episode of “CSI: Crime Scene Investigation”, which is appropriately titled “Unleashed.”

The set-up of the episode, according to CBS, finds the CSI’s reaching out to Grissom’s old gal pal “for help in tracking down the culprit responsible for injuring a woman before she was seemingly mauled to death by a mountain lion.”

Watch Full Episodes of “CSI” on xfinityTV.com

But once Sara (Jorja Fox) and Langston (Laurence Fishburne) get Lady Heather professionally involved in the case, they discover a connection to Heather’s S&M underworld — one in which rich people pay humans to be “their pets.”

Clarke last appeared on “CSI” in a November 2008 episode. She currently costars on The CW’s “Nikita” as a vixenish spy mentor.

Watch a Preview of Lady Heather’s Return in “Unleashed”:

.

“CSI” airs Thursday night at 9 p.m./EST on CBS.