"The Walking Dead's" James Allen McCune, who played Beth's boyfriend Jimmy in Season 2, will join the Showtime drama for multiple episodes. He'll play Matt, a "shy, sweet, inexperienced 20-year-old who takes a shine to Debbie Gallagher," The Hollywood Reporter has learned.
Meanwhile, "See Dad Run" star Danika Yarosh will play Holly, a 15-year-old "helping Debbie transition out of childhood and into the more grown-up world of boys and girls."
"Shameless" returns for its fourth season on Jan. 12 at 9 p.m. ET.
