'The Good Wife' 5.18 Preview: Michael J. Fox's Return Begins a Battle for Power

Fox's Louis Canning upsets Kalinda as he claims himself 'the new Will,' while Diane dubs him 'the devil.'

Michael J. Fox's Louis Canning doesn't receive a warm welcome when he joins Lockhart/Gardner. In a preview for the next episode of "The Good Wife", the manipulative defense lawyer upsets Kalinda for claiming that he's "the new Will." "You're not the new Will," Kalinda tells Louis after throwing a ball onto a wall near him.

Meanwhile, Diane faces the difficult task of working alongside Louis. Louis wants her respect while admitting that he's going to be "the enemy," but Diane snarkily responds, "You're not the enemy. You're the devil."

In "All Tapped Out", Florrick/Agos takes on the case of an NSA whistleblower, only to learn that the agency has been monitoring the firm as well as Alicia's personal life. Also, Alicia goes after the State's Attorney when he attempts to make Finn a scapegoat in the Jeffrey Grant case.

The episode is set to air Sunday, April 20 at 9 P.M. on CBS.