In Yu-Gi-Oh! 3D: Bonds Beyond Time, there is a scene where Paradox appears and kills Pegasus, Sugoroku, and thousands of innocent fans in the process of trying to end Duel Monsters, but I have no clue what time period it takes place in.
I figured it took place between two miscellaneous arcs in the story, but there isn't any evidence supporting that. I was mostly wondering because he somehow used Atem's form despite Atem being freed.
If anyone has any ideas, please let me know.