Some facts !

-Goku’s mother is a Saiyan known as Gine. 

-Launch, who appeared throughout the first Dragon Ball series, never appears in Dragon Ball Z because Akira Toriyama “forgot” she existed. 

-Namekians grow at a faster rate than humans or Saiyans. For this reason, Piccolo is a full grown adult at the age of 3 when he fights Goku at the World Martial Arts Tournament. Also, he’s only four years older than Gohan during the Saiyan saga. 

-Super Saiyan 3 Vegeta first appeared in the 2009 video game Dragon Ball Z: Dragon Battlers that was only released in Japan.