Guest Stars Drew Tanner as Fangs Fogarty Alvin Sanders as Pop Tate Peter Bryant as Principal Waldo Weatherbee Jordan Connor as Sweet Pea Anthony Michael Hall as Principal Featherhead Michael Consuelos as Teen Hiram Lodge Major Curda as Teen Daryl Doiley Co Starring Nikolai Witschl as Dr. Curdle Jr. Sean Kennedy as Forsythe Pendleton Jones I Trevor Stines as Teen Clifford Blossom Simone Sadler as 8 year old Penelope Blossom Sarah Rodgers as Miss Bell Jaden Oehr as 8 year old Clifford Blossom Zachary Hayden as Teen Hal Cooper Craig Meester as Janitor Uncredited K.J. Apa as Teen Fred Andrews Lili Reinhart as Teen Alice Smith Camila Mendes as Teen Hermione Gomez Madelaine Petsch as Teen Penelope Blossom Casey Cott as Teen Tom Keller Charles Melton as Teen Marty Mantle Cole Sprouse as Teen FP Jones Ashleigh Murray as Teen Sierra Samuels