"5.01"^^ . . "Echoes of Grey"@en . . . . "The Guardian of the Solar System was the thirty-third release in the Companion Chronicles audio range. It was the first story of season 5. It was written by Simon Guerrier and featured Sara Kingdom."@en . "BFPDWCC33"@en . . "The Guardian of the Solar System was the thirty-third release in the Companion Chronicles audio range. It was the first story of season 5. It was written by Simon Guerrier and featured Sara Kingdom."@en . . . . . . "First Doctor"@en . . "The Great Clock, 3999"@en . . . . . . . "Solitaire"@en . "The Guardian of the Solar System (audio story)"@en . . "The Guardian of the Solar System"@en . . . . . . "1"^^ . . . "ISBN 978-1-84435-483-2"@en . . .