Episodes
Season 1
8
Season 2
8
Season 3
9
Season 4
8
Season 5
9
Season 6
10
Discussion
Favorite characters
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Himself
Michio Kaku369 votes1 -
Host
Mike Rowe228 votes2 -
Himself
Phil Plait149 votes3 -
Herself
Michelle Thaller80 votes -
Himself
Lawrence Krauss44 votes -
Host
Erik Dellums12 votes
Best commentator
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