Classic TV - Tales of Tomorrow - "Verdict from Space" (1951), Pilot
Gordon Kent is on trial for allegedly killing a scientist in an underground cavern. Desperately, he tries to explain what they found inside the cave, and the the implications for the future of mankind.
https://www.imdb.com/title/tt0717091/?ref_=fn_al_tt_1
This video is in the Public Domain.
https://www.imdb.com/title/tt0717091/?ref_=fn_al_tt_1
This video is in the Public Domain.