Item description:

The story is based on a mysterious enemy who blows
up the Mushroom Kingdom with a nuclear bomb. Problem is the
enemy does that sometime in the future. Mario (and maybe Luigi)
follow the time traveler through his time machine, picking up
clues and hints of the time he is in, and when he blows up
the Mushroom Kingdom. Now the Mario brothers try to prevent
the explosion, even though it hasn’t even happened yet…Or has it?