Joseph P. (Joe) Kerwin

as Self - Skylab-2 Scientist Pilot (NASA Astronaut)

Paul J. Weitz

as Self - Skylab-2 Pilot (NASA Astronaut)

Jack R. Lousma

as Self - Skylab-3 Pilot (NASA Astronaut)

Owen Garriott

as Self - Skylab-3 Scientist Pilot (NASA Astronaut)

Gerald P. (Jerry) Carr

as Self - Skylab-4 Commander (NASA Astronaut)

Edward George Gibson

as Self - Skylab-4 Scientist Pilot (NASA Astronaut)

Luboš Kohoutek

as Self - Astronomer

Bruce McCandless II

as Self - Skylab 2 Backup Crew & AMRV Co-developer (NASA Astronaut)