While GO RUSH!! retains the comedy of its predecessor, it's noticeably darker from the beginning, given the backstory of main protagonist Yudias is that he and 8.88 million of his people have fled a war devastating his system.
Caution: Unmarked spoilers ahead!
- Episode 10 delivers a shocker - Yuhi's Earthdamar can bring monsters to life and it drains Chupataro to do so, leaving him looking like a withered husk. It's the closest the series has truly come to Shadow Duels since Yu-Gi-Oh! ARC-V.
- Episode 12 takes it even further, as Zuwijo uses the Earthdamar to clad himself in the form of his ace monster, Voidvelgr Requiem.
- At the end of Episode 31, Netsuzo is given a gift from the Great King of Terror to cheer him up from his loss against London. Once Netsuzo and one of Sukai's skyfish take a look, all we see subsequently are London's and Fisher Sukai's horrified reactions. The following episode reveals that those who lose are frozen by the Great King of Terror.
- Episode 50 has Damamu nearly disappear after having essentially been born not too long ago, due to Zwijo's use of its power.
- Episode 51 makes it clear that Zwijo would have invaded and conquered Earth if he had succeeded. Given the implied numbers and the scope of an entire star cluster, the advanced technology and the very understandable motivation of wanting to become real lifeforms that would unite the Kartumata humanity's chances would have been very bleak.
- Episode 78 reveals that everything since part way through the Galaxy Cup Finals is an illusion created by Kuaidul. And everyone is still trapped within it by the end of the episode.
- Episode 90 ends with the reveal that the Velgearians are nearing the end of their lifespans, and that their entire species will soon disappear like Kuaidul. In the following episodes not long after, the Kartumata start disappearing.
- Episode 95's depiction of the Dudi Ducasse people gradually disappearing along with their ships is deeply unsettling. One of them reports on how much of the various fleets remains, only to suddenly disappear himself.
