In Volume 17, it is revealed that Gatchan is actually an angel sent by Kami (or the Guardian of Earth, if the story connects withDragon Ball) to prevent further development of the human civilization. After seeing that other civilizations eventually destroyed themselves and the planets they lived on, Kami placed an angel's egg on Earth. Gatchan's ability to replicate as well as his/her fondness of metal should have ensured that humanity would remain primitive and innocent. Seeing that Gatchan failed in the mission (due to Senbei's time traveling intervention), Kami was about to destroy humanity. However, after seeing the life of Penguin Village, he changed his mind and left the earth as it is. Gatchan's real name is a combination of the names of Gamera and Gojira, who is known as Godzilla in the West; hence s/he is known as "Gadzilla" in the English version.
Dr. Slump remake
In the remake, Gatchan came out of a strange looking machine instead of an egg. Also, its hair is blonde instead of green.
Video game appearances
The Gatchans appear in the three Dr. Slump Arale games, Dragon Ball: Daimaō Fukkatsu, Dragon Ball 3: Gokuden, Dragon Ball Z: Super Gokuden: Totsugeki-Hen, Jump Ultimate Stars, Dr. Slump: Arale-Chan, and Dragon Ball: Origins 2. Gatchan 1 & 2 are featured in Arale's ultimate in Dragon Ball Z: Budokai Tenkaichi 3, shooting the enemy with their Antenna Beam after Arale says "The Gatchan are really strong too". Gatchan also appears using his Antenna Beam to attack for Arale in J-Stars Victory Vs. Gatchan is a supporting character in Dragon Ball Heroes.
- 1980's Series - Seiko Nakano
- 1997 Series - Chie Sawaguchi