The alarm began blaring when the Avengers were eating.
"Sir," JARVIS began, "I'm afraid that Experiment 105 has escaped."
"How'd that happen?" Tony demanded, amongst the others' chorus of "WHAT?!". He frowned up at the nearest camera. "J, did you leave DUM-E in charge of feeding again?"
JARVIS sniffed haughtily, sounding as offended as an AI can sound. "Of course not, Sir," he said. "You might recall, you gave it heightened intelligence. It decided it didn't want to be an experiment anymore."
"Unsurprising," Steve muttered under his breath.
"So what does it want to be?" Tony asked.
JARVIS sighed. "Iron Mouse."
There was silence for a moment before another chorus of "WHAT?!" rang out.
"JARVIS, are you messing with me?" Tony demanded. "You'd better be messing with me here!"
"Unfortunately not, Sir," JARVIS replied. "When you fed Experiment 105 the first time, you had been working on the armour and unknowingly gained a small cut, which subsequently bled into the food."
"Are you telling us there's a VAMPIRE MOUSE running around the Tower?!" yelled Clint in the background.
"And somehow that caused it to think that it's, well, me?" demanded Tony, incredulously.
"Yes, Sir," JARVIS agreed, calmly. Then his tone abruptly changed. "Sir! Watch out!"
Something small flashed through the middle of the group, trailing a very faint but familiar sound of repulsors. The Avengers – Earth's Mightiest Heroes – shrieked, ducked, and tried to bat the thing away. It landed on the table in a familiar pose, aiming its paws at Tony.
"Why the hell is an escaped experiment in my kitchen in a suit?!" Tony demanded. "JARVIS, how the hell did it make that?!"
"With a great deal of determination and ingenuity," the AI said. "It is, after all, only a mouse."
The mouse squeaked indignantly. "I … am … Iron Mouse!"