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 Prof. Chris Perry 1 guest appearances Ra Bun Theurm 1 guest appearances Caroline Ciavaldini 1 guest appearances Franco Barattini 1 guest appearances Minoru Kinoshita 1 guest appearances Logan Doull 1 guest appearances Dr. Ian D. MacLeod 1 guest appearances Marlice Van Vuuren 1 guest appearances Vanessa Blanquez Carmona 1 guest appearances Claudia Carmona 1 guest appearances Marina Carmona 1 guest appearances Esentai Bekbolat 1 guest appearances Esen Sailau 1 guest appearances Uvaserua Tjiposa 1 guest appearances Julie Misaki 1 guest appearances Rocky Robinson 1 guest appearances Prof. Abel Mendez 1 guest appearances Pak Naspin 1 guest appearances Shanta Deva 1 guest appearances ⇤ « 1 2 3 » ⇥