86-year-old Irving Zisman is on a journey across America with the most unlikely companion: his 8 year-old grandson, Billy.
Johnny Knoxville
as Irving Zisman
Jackson Nicoll
as Billy Zisman-Muskie
Georgina Cates
as Kimmie Zisman
Catherine Keener
as Ellie Zisman
Spike Jonze
as Gloria
Kamber Hejlik
as Doctor
Grasie Mercedes
as Hostess
Jack Polick
as Funeral Worker
Zia Harris
as Chuck Muskie
Jill Killington
as Pageant Reporter
Madison Davis
as Juggalo Girl
George Faughnan
as Juggalo Guy