Robert Lee
Self - Narrator (voice) (272 eps)
Adam Savage
Self - Host (258 eps)
Jamie Hyneman
Self - Host (258 eps)
Kari Byron
Self - Host (223 eps)
Tory Belleci
Self - Host (223 eps)
Grant Imahara
Self - Host (223 eps)
Jessi Combs
Self - Host (24 eps)
Brian Louden
Self - Host (14 eps)
Jonathan Lung
Self - Host (14 eps)
John McLeod
Self (3 eps)
Tony Shalhoub
Self (2 eps)
Dan Green
Self (2 eps)
Jacques Bergerac
Self (2 eps)
James Cameron
Self (2 eps)
Barack Obama
Self (2 eps)
Roger Clemens
Self (1 eps)
Jonathan Banks
Self (1 eps)
Vince Gilligan
Self (1 eps)
Colby Boothman-Shepard
Self (1 eps)
Seth Rogen
Self (1 eps)
Alton Brown
Self (1 eps)
Jessi Combs
Host - Self (1 eps)
Neil deGrasse Tyson
Self (1 eps)
Stephen Colbert
Self (1 eps)
Sophia Bush
Self / Princess Leia (1 eps)