The “Scrubs’’ reboot, complete with an altered cast and concept, was supposed to be awful. The ABC sitcom, returning tonight at 9 on Channel 5, seemed destined to arrive looking like a shadow of a replica of its former self. In sharp decline already for three or four seasons, “Scrubs’’ 2.0 would have to be a depleted thing, a sponge used once too often.
But new characters and a change of scenery have revived the show to some degree. Returning longtime stars Zach Braff as J.D. and Donald Faison as Turk appear to be enjoying the new setup, while they continue their bromantic escapades with each other to strains of their song “Guy Love.’’ Now teachers at the hospital’s medical school, J.D., Turk, and Dr. Cox (John C. McGinley) toy with their students as they reveal their unusual approaches to education. J.D. is fixated on being liked, practicing “teacher-tainment’’ by holding a class while sitting in a tree. His big fantasy is to be called “Dr. D’’ by students in the school quad - despite the fact that, as one student points out, there is no quad. As cruel as ever, Cox rules by fear, telling the newbies, “You are all murderers and assassins that have been sent here to try to kill my patients.’’