William and Ethan explain the history and various missions of Interkosmos, the program that sent socialist cosmonauts from all over the world into space on Soviet ships.

Outro: Sun Ra, "Interstellar Low Ways"

Further Reading: 

Burgess, Colin & Bert Vis. Interkosmos: The Eastern Bloc's Early Space ProgramCaswell, Kurt. Laika's Window: The Legacy of a Soviet Space Dog.Petrov, G.I. (Ed.), Conquest of Outer Space in the USSR