John Zarnecki

饰：Self - Huygens SSP Principal Investigator,(as Professor John Zarnecki)

Ralph Lorenz

饰：Self - Huygens SSP Co-Investigator,(as Dr Ralph Lorenz)

Jean-Pierre Lebreton

饰：Himself - Huygens Project Scientist

尤里·加加林

Yuri Gagarin

饰：Self,(archive footage)

帕特里克·摩尔

Patrick Moore

饰：Self,(as Sir Patrick Moore)