Bad Grandpa .5 gives you a whole new perspective on the world of Irving Zisman with bonus scenes and pranks also featuring Spike Jonze as "Gloria" and Catherine Keener as Irving's wife "Ellie", plus a look at the evolution of Johnny Knoxville's naughty alter-ego, the makeup effects, and a behind-the-scenes peek at the idiocy it takes to make a hidden camera movie in public.

Eighty-six-year-old Irving Zisman is on a journey across America with the most unlikely companion: his eight-year-old grandson Billy, in "Jackass Presents: Bad Grandpa". Jackass characters Irving Zisman (Johnny Knoxville) and Billy (Jackson Nicoll) will take movie audiences along for the most insane hidden camera road trip ever captured on camera. Along the way Irving will introduce the young and impressionable Billy to people, places, and situations that give new meaning to the term "childrearing". The duo will encounter male strippers, disgruntled child beauty pageant contestants (and their equally disgruntled mothers), funeral home mourners, biker bar patrons, and a whole lot of unsuspecting citizens. Real people in unreal situations, making for one really messed up comedy.

Brad Gluckman (Kennedy) is a wannabe rap star from Malibu who acts and talks like he's from the "'hood." Concerned that his son is going to embarrass him during his campaign to become the governor of California, Brad's wealthy father and his campaign manager (Underwood), hire two trained actors (Diggs and Anderson) to disguise themselves as "real life gangstaz", and kidnap his son, dropping him off in the "real hood" in Compton, in an effort to scare the ghettofied attitude and behavior out of him.