‘We didn’t know until the last minute’: Megan Mullally reveals the cast was surprised when NBC announced Will & Grace was coming back The actress, who played Karen Walker on the series, guest starred on Jimmy Kimmel Live on Thursday night where she talked about the show’s anticipated return. We’re back! Megan Mullally appeared on Jimmy Kimmel Live on Thursday where she dished on the return of Will & Grace to NBC ‘We didn’t even really know officially until a day before yesterday that it was really officially real, for real, coming back,’ Megan told the late night host.