Changes

* This card monster appears in the artworks of "[[Descending Lost Star]]", "[[Mind Pollutant]]" and "[[Mist Valley Thunder Lord]]".

* This was the first "[[Ally of Justice]]" monster to be released in the ''[[TCG]]''.

* "Catastor" has a prototype version called "[[Ally of Justice Core Destroyer]]", which has a similar, albeit more restrictive effect.

* As with other "Ally of Justice" Synchro Monsters, an "[[Ally Mind]]" is can be seen embedded in the headas an eye. Ironically, it can't be used to Synchro Summon this card unless its Level is decreased, since both cards are Level 5.** It is identical to (in the same fashion as "[[Quickdraw Synchron]]" and "[[Junk Warrior]]" situation).** However, according to the ''[[Duel Terminal]]'' storyline, "Catastor" was created before "Ally Mind" – the object appearing in the artwork of "Catastor" might be a prototype or precursor to "Ally Mind". This may explain why the two monsters share the same Level.

* This card, along with "[[Brionac, Dragon of the Ice Barrier]]", and "[[Mist Wurm]]", and "[[Naturia Beast]]" were all short printed in ''[[Hidden Arsenal]]'', so you would only find a maximum of 1 to 2 of each would have been found per-36-packs booster box, making them exceedingly rare.

* Considering this monster is on the artwork of "[[Descending Lost Star]]", and possibly considering the relationship between Synchro Monsters and the alignment of stars, "Catastor" is likely derived from "catasterism," the act of immortalizing something as a constellation of stars.** Alternatively, "Catastor" could be a play on the word "catastrophe" considering its powerful destruction effect.

* In the artwork for "Mist Valley Thunder Lord", it is carrying the head of "Catastor", implying that it defeated "Catastor". In the context of the actual card game, this would be impossible as "Mist Valley Thunder Lord" cannot beat "Catastor" normally due to the effect of "Catastor" that automatically destroys any non-[[DARK]] monster.** This defeat of "Catastor" appears in the artwork of "Mind Polutant", where "[[Fabled Raven]]" was controlling "Thunder Lord". * This monster has an "[[lswarm]]" counterpart, "[[Evilswarm Golem]]". * This card was illegal to play in ''TCG'' tournaments following its initial North American release in ''[[Duel Terminal - Preview Wave 2]]''. This was because the ''Duel Terminal Preview'' sets were made as a special release for Comic Con in August 2009, and was only available in extremely limited quantities. "Catastor" wasn't officially released until ''[[Hidden Arsenal]]'' came out in November of the same year, after which it was legal to use.