Batman (1966)

S3E24 The Joker's Flying Saucer

The Joker returns to Gotham City with a nefarious plan for global takeover. He spreads false rumors about an extraterrestrial invasion while seeking Beryllium metal to construct a genuine flying saucer. Batman quickly catches onto his plot and dispatches Alfred to investigate a hidden supply of the metal. However, Alfred is mistaken for a mad scientist by the Joker and is captured alongside Batgirl. As the Dynamic Duo rush to the rescue, a bomb planted by one of the Joker's goons detonates, rendering them unconscious and isolating the Batcave from the outside world.