Kathryn Coombs

饰：自己

Henry Raven

饰：自己 Self

Stephen Wolfsberger

Stephen Wolfsberger

饰：自己

Jared Morrison

饰：自己

Buzz Mooney

饰：自己

Ben Kullman

饰：自己

比尔·奈

Bill Nye

饰：自己 Self

凯文·R·赫舍贝格

Kevin Hershberger

饰：自己

Scott Zeiss

饰：Thomas Hunt Morgan

Louise Rusnak

饰：Librarian (2004)

Sam Edens

Sam Edens

饰：Sir Isaac Newton

Kathryn Kent

饰：Mrs Roentgen, medicine & chemistry episodes

Keith E. Whitehead

饰：Zoologist Eduard Van Beneden - Biology Episode

Paul Bugelski

饰：Johannes Keppler

Ed Mantell

Ed Mantell

饰：18th Century Graverobber