Dragon Ball - Season 1 - Eps 75: The Strong Ones
The fox mask-wearing fifth man is no ordinary person! A breathless offensive-defensive battle unfolds!! And then the fox mask man fires a Kamehameha of all things! But Goku doesn’t lose, and returns fire with his own Kamehameha, knocking the man down! In the instant it seemed like Goku had won, the fox mask man grabs onto Goku’s weakness, his tail! Seeing this, the Turtle Hermit realizes the fox mask man’s identity. He says that the opponent’s identity is Son Goku’s dead adoptive grandfather, Son Gohan!!
About Dragon Ball

Title: Dragon Ball
First Air Date: 1986-02-26
Last Air Date: 1989-04-19
Status: Ended
Rating: 8.3/10 (from 3210 votes)
Language: JA
Seasons: 2
Total Episodes: 153
Network: Fuji TV
Genres: Animation, Action & Adventure, Sci-Fi & Fantasy
Production Companies: Toei Animation, Shueisha, Bird Studios
Synopsis
Young Goku sets off on a quest with his teenage friend Bulma to find the seven Dragon Balls, which grant whoever possesses them a single wish.
Cast

Masako Nozawa
Son Goku (voice)

Mayumi Tanaka
Krillin (voice)

Hiromi Tsuru
Bulma (voice)

Toru Furuya
Yamcha (voice)

Naoki Tatsuta
Oolong (voice)

Naoko Watanabe
Puar (voice)

Mami Koyama
Lunch (voice)

Shigeru Chiba
Emperor Pilaf (voice)

Joji Yanami
Narrator (voice)

Chikao Ohtsuka
Tao Pai Pai (voice)