Main Characters Host 11 main appearances Chris Hadfield 11 main appearances Jerry Linenger 11 main appearances Mike Massimino 11 main appearances Leland Melvin 11 main appearances Nicole Stott 11 main appearances Mae Jemison 10 main appearances Jeff Hoffman 8 main appearances Peggy Whitson 3 main appearances
Recurring Guest Characters Dr. Felipe Gómez Gómez 2 guest appearances Kidane Belay 2 guest appearances Dr. Rosa Maria Dos Santos 2 guest appearances Dr. Heidi Sevestre 2 guest appearances Dr. Nelson Gadea 2 guest appearances Pra Chayanon 2 guest appearances Kuat Hafarov 2 guest appearances Lama Samdup 2 guest appearances Keith Whitson 2 guest appearances Beth Whitson 2 guest appearances Thomas Senf 1 guest appearances Guillaume Nery 1 guest appearances Adam Aaronson 1 guest appearances Lukasi Nappaaluk 1 guest appearances Frank Willems 1 guest appearances Xiao Qiang 1 guest appearances Prof. Ken Sims 1 guest appearances Aldo Kane 1 guest appearances Romo Ngatik 1 guest appearances Morgan Sandercock 1 guest appearances ⇤ « 1 2 3 » ⇥