You know how Donkey Kong and all of his Kong friends have been cameoing in various Mario spin-offs over the past decade or so?
Have you ever thought: "What if it was the other way around? What if the Mario characters had made a cameo in a Donkey Kong game?"
If you have thought this, then
have I got a treat for you:
This my friends is the earliest known version of Diddy Kong Pilot, shown at Spaceworld 2001. The biggest "[wtd]" about this version is the fact that
six whole Mario characters appear amongst the playable roster! From the footage I could make out Mario, Peach, Yoshi, Toad, Wario and Bowser.
So yeah. At one point in time, there was to be a DK spin-off featuring Mario characters instead of the other way around. Mind blown.