The Munsters (1964)

S1E9 Knock Wood, Here Comes Charlie

Herman’s twin brother, Charlie, a sly con artist, arrives in town and moves into the Munster household, much to Herman's dismay. Charlie boasts about his latest invention that supposedly extracts uranium from seawater and seeks an investor to fund it. Suspicious of Charlie's intentions, Herman suspects he’s merely trying to swindle Lily out of her $5000 inheritance. As events unfold, Herman's instincts prove correct, revealing Charlie's true motives behind the elaborate scheme.