I'll Be a Mummy's Uncle

Name: I'll Be a Mummy's Uncle
Director: Sam Strangis
Released: 1968-02-22
Duration: 25 min
Rating: 7.6
Cast: Henny Youngman, Victor Buono, Kathleen Freeman, Cesar Romero, Jock Mahoney

S3 E23 February 22, 1968 0h 25m ★ 7.6

Source:

Overview

With plans to build an indestructible empire, King Tut goes in search of Nilanium, the world's strongest metal. But with the only known deposit lying directly beneath Wayne Manor, Tut's tunneling soon leads him to the discovery of a lifetime - the Batcave itself. With their secret identities in jeopardy, Batman and Robin race to stop him before his find is leaked to the world.