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