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. Hazel Barton 1 guest appearances Federico Pisani 1 guest appearances Lee Koon Yau 1 guest appearances Prof. Liane G. Benning 1 guest appearances Prof. Kenny Broad 1 guest appearances Prof. Roger Smith 1 guest appearances Karla Colmenero 1 guest appearances Tyler Winter 1 guest appearances Pappa Icca 1 guest appearances Lucas Spelman 1 guest appearances Petr Nesterov 1 guest appearances Alina Nesterov 1 guest appearances Capt. Ty "Red" Bowen 1 guest appearances Dr. Iain Kerr 1 guest appearances Jonathan Paredes 1 guest appearances Prof. Timothy Mousseau 1 guest appearances Dr. Jocelyn Dunn 1 guest appearances Mohamed El Ghanny 1 guest appearances Omar Medina Ramirez 1 guest appearances Isak Mathis Triumf 1 guest appearances ⇤ « 1 2 3 » ⇥