So, I have the plan of a few cross universe episodes. Mainly its just Roo playing a prank with Max's summoning magic do he is another universe for 2-4 Chapters a universe. Here is the list of planned universes.

Supernatural

Dr. Who (10th or 11th)

Rencarnated as a Slime

And maybe a few more. Feel free to suggest any you would like to see. None of these will be story heavy at all, just thought it would be interesting

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