With Duo beginning its Earth Erasure plans, its fascinated by Lan and Chaud's cross fusion and decides to spare the planet for the time being to learn more and sets out to give humanity a test.
- Attack of the 50-Foot Whatever: Duo sends giant viruses to menace various parts of the world.
- Curb-Stomp Battle: Slur effortlessly defeats Bass. The movie reveals he's trapped in the Undernet.
- Early-Bird Cameo: Charlie, Dingo, Jasmine, Baryl, Tesla, Laika and Princess Pride are briefly seen during the worldwide virus attack. Although for Laika and Pride its Early Bird Reintroduction.
- Foreshadowing: The can of juice Wily gives Lan the previous episode contains blueprints for a dimensional generators, allowing Sci Lab to remotely send dimensional areas anywhere they need without needing to enter the location in question.
- Mark of the Supernatural: Duo gives the main cast this season their crests of Duo, but right now, only Lan is affected being able to see Duo's comet.
- Reset Button: After deciding to learn more about cross fusion and letting Earth lives for now, Duo undoes all the damage his giant viruses caused.
- Self-Made Orphan: Lan and Chaud are shown a vision of Earth getting destroyed. Duo tells them it wasn't Earth, but the planet he came from and his mission is to travel the universe and destroy any potentially dangerous planets, starting with his own.
- Staring Down Cthulhu: Lan and Chaud warn Duo that if it plans to destroy Earth, they're willing to stop him.
- Skewed Priorities: Wily's reason for refusing to let Duo erase the Earth, and helping Sci Lab? He want to continue eating food.
- Wowing Cthulhu: After seeing Lan and Chaud delete the giant viruses, Duo quickly delete them or recalls them and brings them to space, asking if they are humans are net navis.
