Майк Уоллес
В роли: Self - Correspondent (segment "The Decision")

Charles Strom
В роли: Self - Geneticist, Illinois Masonic Hospital (segment "The Decision")

Linda Waldeck
В роли: Self - Mother of Child with Cystic Fibrosis (segment "The Decision")

Bill Waldeck
В роли: Self - Father of Child with Cystic Fibrosis (segment "The Decision")

Phillip Reilly
В роли: Self - Genetic Scientist, Shriver Center (segment "The Decision")

Marty Davis
В роли: Self - Dwarf (segment "The Decision")

Francis Collins
В роли: Self - Geneticist (segment "The Decision") (как Dr. Francis Collins)

Barbara Biesecker
В роли: Self - Genetic Counselor, University of Michigan (segment "The Decision")

Jamie Manikian
В роли: Self - Mother of Four (segment "The Decision")

Barry Lando
В роли: Self - Producer (segment "The Decision")

Steve Kroft
В роли: Self - Correspondent (segment "Wally World")

Wally Hickel
В роли: Self - Governor, Alaska (segment "Wally World")

Joe Vogler
В роли: Self - Alaskan Independence Party (segment "Wally World")

Jim Doogan
В роли: Self - Anchorage Daily News (segment "Wally World")

Jack Hession
В роли: Self - Sierra Club (segment "Wally World")

Morley Safer
В роли: Self - Correspondent (segment "Doctor's Dilemma")

James Noble Hendrix
В роли: Self - Former Physician (segment "Doctor's Dilemma")

Nancy Dickey
В роли: Self - Doctor (segment "Doctor's Dilemma")

George Wolverton
В роли: Self - Former Physician (segment "Doctor's Dilemma")

Michael Myers
В роли: Self - Doctor (segment "Doctor's Dilemma")

Jay Scharoff
В роли: Self - Former Physician (segment "Doctor's Dilemma")

Andrew Rooney
В роли: Self - Commentator (segment "Andy Rooney")