Lupin the 3rd S01 E05 The Coming of Goemon the Thirteenth

Goemon Ishikawa XIII is the thirteenth direct descendant of the famous samurai highwayman Ishikawa Goemon. Goemon's mentor has given him a mission; find Lupin and use the invincible Zantetsuken eliminate him. Neither Goemon nor Lupin know that Goemon's mentor and Fujiko are actually working together.