Bradley Cooper as Phil Wenneck

Ed Helms as Stu Price

Zach Galifianakis as Alan Garner

Justin Bartha as Doug Billings

Ken Jeong as Mr. Chow

Paul Giamatti as Kingsley

Mike Tyson as Mike Tyson

Jeffrey Tambor as Sid Garner

Mason Lee as Teddy

Jamie Chung as Lauren

Sasha Barrese as Tracy

Gillian Vigman as Stephanie

Aroon Seeboonruang as Monk

Nirut Sirijanya as Fohn

Yasmin Lee as Kimmy

Nick Cassavetes as Tattoo Joe

Sondra Currie as Linda Garner

Bryan Callen as Samir

Brody Stevens as Kingsley Guy

Byron Gibson as Bar Fighter

Michael Berry Jr. as Vladi

Andrew Howard as Nikolai

Danai Thiengdham as Cell Block Officer

Thana Srisuke as Fighting Monk

Pairot Noiply as Shouting Man

Penpak Sirikul as Joi

Sanita Jai-Ua as Hostess #1

Chanicha Shindejanichakul as Hostess #2

Vithaya Pansringarm as Minister

Kim Lee as Dancer

Palakorn Chaiklang as Wedding Band / Ska Ranger

Palakorn Gunjina as Wedding Band / Ska Ranger

Pongsatorn Sawadchatchawan as Wedding Band / Ska Ranger

Kaweewit Chaikaew as Wedding Band / Ska Ranger

Pure Watanabe as Wedding Band / Ska Ranger

Rattana Janprasit as Wedding Band / Ska Ranger

Jetsada Yuktabutra as Wedding Band / Ska Ranger

Tanner Maguire as Phil - 12 Years Old

William A. Johnson as Stu - 12 Years Old

Aedin Mincks as Alan - 12 years old

Dylan Boyack as Doug - 12 Years Old

William Jiang as Chow - 12 Years Old

Lynne Kidder as Woman at Restaurant

Frédéric North as Helicopter Pilot

Crystal the Monkey as Drug Dealing Monkey

Todd Phillips as Mr. Creepy (uncredited)

Manel Soler as Kingsley Guy #2 (uncredited)

Jessica Lee as Thai Club Girl (uncredited)