william-james88 wrote:The planet in Japanese is called Seibertron?
In Japanese G1, Beast Era, and Unicron Trilogy-related media, yes. Pronounced like "say-ber-tron", as the Autobot faction was called "Cybertron" ("sigh-ber-tron").
Since 2007, however, Takara has taken to using more and more Hasbro terminology to create a better sense of global cohesiveness for the brand in Japan, so things like the movies, Animated, Prime, Go!, Adventure, etc. use "Cybertron" for the planet's name in the Japanese versions of those.
But since this comic is part of the Japanese G1 continuity, Sakamoto-san likely wanted to preserve the original Japanese terminology for this comic so as to better allow it to tie in with the 1980s Japanese media.
Here's a rundown of which toylines in Japan (and their respective media of fiction) used which names from 2007 to today:
Binaltech (2007 onward) - Takara names
Masterpiece (2007 onward) - Takara names
2007 Movie 1 - Hasbro names
Beast Wars Telemocha Series - Takara names
Encore - Takara names
Music Label - Takara names (save for the fully-colored Music Label Optimus Prime)
Sports Label - Takara names
Henkei! Henkei! - Takara names
Alternity - Takara names
Revenge of the Fallen - Hasbro names
Device Label - Takara names
Autobot Alliance - Hasbro names
Animated - Hasbro names (save for renaming Bulkhead as "Ironhide" and Ironhide as "Armorhide")
United - Hasbro names
Dark of the Moon - Hasbro names
Chronicle - Hasbro names and Takara names for certain figures (the two box sets used Hasbro names, while the EZ Collection figures used Hasbro names for only the Movieverse Legends class molds and Takara names for the G1/G2-based Legends class molds)
Prime Arms Micron - Hasbro names
Generations - Hasbro names
BeCool - all new names by Takara based on the toys' altmodes
Cap Bots - all new names by Takara but based on Hasbro's kind of names
GT - all new names by Takara based on Hasbro's names
Kre-O - Hasbro names
Go! - Hasbro names for the non-new characters, all new names by Takara for the new characters
Cloud - Hasbro names (save for Hot Rodimus)
Movie Advanced Series - Hasbro names
Lost Age Series - Hasbro names
Legends - BOTH names! Takara names in Katakana, Hasbro names in Latin script
Q-Transformers - A varying mixture of Hasbro and Takara names
Adventure Series - Hasbro names for the most part, but Greejeeber, Adams, and (supposedly) Stepper use Takara names in both Katakana and Latin script, while Shrapnel has his Takara name "Sharpnel" in Katakana and his Hasbro name in Latin script
Easy Dynamic Series - Hasbro names
Mini-Con Series - some Hasbro names, some all new names by Takara
Unite Warriors - Takara names in Katakana and Hasbro names in Latin script