"Scrubs" returns with fresh episodes next January, and ET has new details about guest star Courteney Cox's shady character on the quirky medical comedy!

Courteney will play a beautiful but unethical doctor who could prove troublesome to J.D. (Zach Braff) and the rest of the gang at Sacred Heart Hospital. Also on the premiere episode, J.D. struggles to keep a new crop of bumbling interns in line, and Carla (Judy Reyes) helps Elliott (Sarah Chalke) keep her ego in check!

Catch Courteney on back-to-back episodes of "Scrubs"' eighth season, premiering Tuesday, January 6 on ABC.