Mario, with all 120 power stars, was about to go face Bowser for the third and final time up at the top of Princess Peach's castle. But he decided to take a pit-stop outside. He ran out to the little cannon in the ground near the lake...cause that's totally logical, a cannon by a lake on castle grounds. He hopped in and blasted himself up to the top of the castle.
"Yoshi? I'm-a here, give-a me my lives!" He ran around to the back of the castle and stumbled back when he saw...Yoshi there, dead on the ground. "What in the name of-a the almighty mushroom?"
Iron Man flew down behind him and finished off his beer. "I am Iron Man, and that freaky dinosaur wouldn't let me ride him...he had to die." He tossed his beer away and looked down at Mario. "You look familiar, have I blasted you before?"
"Yes...into a lake!" Mario shouted as he fired a fireball at Iron Man's head. The attack was so slow though, Iron Man just stepped aside. "Well this sucks..."
"You know it, plumber boy." Iron Man picked up Mario by the suspenders and tossed him into the sky. He quickly fired a shot at him and Mario blew up in the distance. Iron Man stood there, silent for a moment. "Yeah, I still don't remember who he was. Oh well!" He picked up Yoshi. "This'll make a nice rug..." Iron Man flew off into the distance with the dead Yoshi in hand.