Nir Barzilai

饰：Himself - Albert Einstein College of Medicine

Rochelle Buffenstein

饰：Herself - University of Texas

Jan Corsellis

饰：Himself - Runwell Hospital

Don Fitch

饰：Himself

L.M. Franks

饰：Himself - Imperial Cancer Research Fund

Gary Fraser

饰：Himself - Loma Linda University

Ellen Langer

饰：Herself - Harvard University

Kelly Morton

饰：Herself

Jerry Shay

饰：Himself - University of Texas, Dallas

Johnny Ball

饰：Self - Presenter

迈克尔·莫斯利

Michael J. Mosley

饰：Self,(archive footage) (as Michael J. Mosley)

利兹·博宁

Liz Bonnin

饰：Self,(archive footage)

Alex Comfort

饰：Self - University College London,(archive footage) (as Prof Alex Comfort)

Doris Taylor

饰：Self - University of Minnesota,(archive footage) (as Dr Doris Taylor)

Roy Walford

饰：Self - University of California,(archive footage) (as Prof Roy Walford)