Rygol 7 is a planet only mentioned by name in episode 23 of the Saban dub, when Vegeta explains to Goku how his squad had trouble defending against the advanced technology used by the planet's people to repel the Saiyans, until Goku's father developed the "fake moon" technique used to transform into a Great Ape in the absence of a lunar body.
This line is removed entirely from the 2005 FUNimation redub and was not present in the original Japanese version either. This statement also brings about clear examples of notable inconsistencies and mistakes by FUNimation/Saban, such as Vegeta stating that Goku's "brilliant scientist" father created the technique which allowed them to achieve victory. With the release of Dragon Ball Z: Bardock - The Father of Goku, it is shown that Bardock perished with the destruction of his planet at the hands of Frieza in Age 737. It would also have been implausible for Vegeta to have fought alongside Bardock as he was only five years of age at the time of Bardock's death, and that Bardock was considered a low-class Saiyan warrior.
- Rigel 7 is the name of a planet in The Simpsons, in which the alien duo Kang and Kodos are from. It is pronounced exactly like "Rygol 7" in English, and it is possible that FUNimation (the script writers) deliberately used the name.