 Recurring characters who appear in "Vitamin D" are glee club members Santana Lopez (Naya Rivera), Brittany Pierce (Heather Morris), Mike Chang (Harry Shum, Jr.) and Matt Rutherford (Dijon Talton), former glee club director Sandy Ryerson (Stephen Tobolowsky), Principal Figgins (Theba), football coach Ken Tanaka (Gallagher), Terri's co-worker Howard Bamboo (Kent Avenido), and local news anchors Rod Remington (Bill A. Jones) and Andrea Carmichael (Earlene Davis).Joe Hursley guest stars as Joe.The episode features mash-up covers of "It's My Life" by Bon Jovi and "Confessions Part II" by Usher, and "Halo" by Beyoncé Knowles and "Walking on Sunshine" by Katrina and the Waves.