El viaje más largo

Jordi Boixaderas

— Self - Narrator (voice)

José María Madiedo

— Self - Astrophysic

Ana Pires

— Self - INESCTEC/ISEP Researcher

Ignacio Horcada

— Self - Spanish Navy Vice Admiral

Bruno Gonçalves Neves

— Self - Portuguese Navy Lieutenant

Guadalupe Fernández

— Self - Historian

Pablo Emilio Pérez-Mallaína

— Self - Historian

Silvestre de Almeida Lacerda

— Self - Historian

José Marques

— Self - V Centenary Commission President

Xabier Alberdi

— Self - Historian

María Antonia Colomar Albajar

— Self - Historian

Tomás Mazón

— Self - Researcher

Yuri Gagarin

— Self - Cosmonaut (archive footage)

John F. Kennedy

— Self - Politician (archive footage)