Скотт Пиллей
В роли: Self - Correspondent (segment "Breakthrough Status")

Nancy Justice
В роли: Self - Cancer Patient (segment "Breakthrough Status")

Annick Desjardins
В роли: Self - Neuro-oncologist (segment "Breakthrough Status")

Greg Justice
В роли: Self - Nancy's Husband (segment "Breakthrough Status")

Darell Bigner
В роли: Self - Director, Tisch Brain Tumor Center (segment "Breakthrough Status")

Henry Friedman
В роли: Self - Neuro-oncologist (segment "Breakthrough Status")

Matthias Gromeier
В роли: Self - Molecular Biologist (segment "Breakthrough Status")

Stephanie Lipscomb
В роли: Self - Cancer Patient (segment "Breakthrough Status")

Fritz Andersen
В роли: Self - Cancer Patient (segment "Breakthrough Status") (как Dr. Fritz Andersen)

Donna Clegg
В роли: Self - Cancer Patient (segment "Breakthrough Status")

Brendan Steele
В роли: Self - Cancer Patient (segment "Breakthrough Status")

Kathy Steele
В роли: Self - Brendan's Wife (segment "Breakthrough Status")

Allan Friedman
В роли: Self - Neurosurgeon (segment "Breakthrough Status")

Smita Nair
В роли: Self - Immunologist (segment "Breakthrough Status") (как Smita Nair)

Bill Whitaker
В роли: Self - Correspondent (segment "Collateral Damage")

Xiaoxing Xi
В роли: Self - Scientist (segment "Collateral Damage")

Sherry Chen
В роли: Self - Flood Forecaster (segment "Collateral Damage")

Peter Zeidenberg
В роли: Self - Attorney (segment "Collateral Damage")