Pictured: Austin Mahone guest stars as young Adam. Just as Nathan begins to unwind on his solo vacation in the Bahamas, Carol makes a surprise appearance and gets him riled up all over again, until they meet Ganja Pete. Meanwhile, Debbie gets upset with Adam when she learns that he used to write love songs for the special girls in his life when he was younger, on THE MILLERS Thurs. March 6 (8:31-9:01 PM, ET/PT) on the CBS Television Network. Tommy Chong guest stars as Ganja Pete. Austin Mahone guest stars as young Adam. Photo: Cliff Lipson/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.