Time Jam: Valerian & Laureline

It's About Time (1x17)

Air date: Dec 15, 2007

Valerian and Laureline return to the solar system where Earth once was. They hear weak signals coming from the still-intact moon! After touching down, they discover a Moonbase and inside, archival footage featuring a mysterious gray-haired gentleman who offers a clue as to what happened to the Earth.