Jason Kelly (Zac Efron), an uptight lawyer headed down the wrong path, is tricked by his rambunctious Grandpa, Dick (Robert De Niro), into taking an outrageous road trip. While his methods may be unconventional, Dick is determined to teach him how to live life on his own terms. br br DIRTY GRANDPA Trailer (RED BAND) br br Cast : Starring Robert De Niro, Zac Efron, Aubrey Plaza, Zoey Deutch, Julianne Hough, Jason Mantzoukas, Danny Glover, Adam Pally, and Dermot Mulroney.