|Series:||SP, SD, Mattyverse, Dyonverse?|
|Genre:||Platformer, Boss Rush|
8OS5 is a boss rush game featuring characters from different series. Each character has to go through a series of different bosses until they reach the final boss, which uses strategies and techniques from all the bosses the player fought prior.
Once all the creatures arrive, they are greeted by scroll guy who tells them that the dimension holds a great threat that is currently feeding off of different fights through time and space. The creatures must destroy the energy sources of the threat by defeating the bosses behind some locked doors, each having a wire hooked up to one huge locked door. Once all those energy sources are defeated, the wires stop feeding the threat, and towards the end the creatures discover the final boss, which is an entity that was somehow transported from the post cloud crisis (after the cloud was vanquished) in the form of a smile made from what appears to be muscle tissue nicknamed Havoc. Once Havoc is defeated, it squirms out of the room its held in and slithers away from the creatures, temporarily lowering the threat.