Ultraman - Season 1 - Eps 1: Ultra Operation No. 1
The episode that started it all! This episode shows how Ultraman came to Earth, and during his chase with the fugitive monster Bemular, a tragic accident that befell Science Patrol member Hayata forces the alien to save the Earthling's life by merging with him. Thus, unbeknownst to anyone (even his Science Patrol teammates), Hayata and Ultraman are now one and the same! The course of the episode has Hayata and his teammates coping with the terrifying Bemular.
About Ultraman

Title: Ultraman
First Air Date: 1966-07-17
Last Air Date: 1967-04-09
Status: Ended
Rating: 8.3/10 (from 42 votes)
Language: JA
Seasons: 2
Total Episodes: 39
Network: TBS
Genres: Action & Adventure, Sci-Fi & Fantasy, Mystery
Production Companies: Tsuburaya Productions, Tokyo Laboratory
Synopsis
Hayata is a member of the Science Patrol, an organization tasked with investigating bizarre anomalies. He is mortally wounded when accidently encountering an alien being from Land of Light, who grants Hayata new life as the two are merged into one. Now, whenever a threat arises that is too great for the Science Patrol to handle, Hayata activates the beta capsule and becomes the hero known as Ultraman.
Cast

Susumu Kurobe
Shin Hayata / Ultraman

Akiji Kobayashi
Captain 'Cap' Toshio Muramatsu

Sandayuu Dokumamushi
Daisuke Arashi

Hiroko Sakurai
Akiko Fuji

Masaya Nihei
Mitsuhiro Ide

Akihide Tsuzawa
Isamu Hoshino

Akihiko Hirata
Dr. Iwamoto

Koji Ishizaka
Narrator

Hikaru Urano
Narrator

Bin Furuya
Ultraman