Zach Galifianakis and his oddball crew take a road trip to complete aseries of high-profile celebrity interviews and restore hisreputation. Celebrity cameos include:Matthew McconaugheyWill FerrellPeter DinklageBenedict CumberbatchPaul RuddTiffany HaddishBrie LarsonKeanu ReevesJon HammDavid LettermanJason SchwartzmanAdam ScottJohn ChoChance the RapperRashida JonesHailee SteinfeldJohn LegendChrissy TeigenTessa Thompson