Babylon 5: "Messages from Earth"
Covered briefly in Frank Garcia's "Babylon 5 Episode Guide," Cinefantastique 31.12/Vol. 32 No. 1 (June 2000): 74. See Babylon 5 entry for link to locations on line where the relevant Cinefantastique issues are likely to be archived. See this episode for "Earth's secret operation to exploit Shadow technology," most directly Shadow vessels, one "buried on Mars" and earlier excavated and one that "has been found on the Jovian moon Ganymede" (Cinefantastique loc cit.).
RDE, finishing, 31Aug22