Professor Squawkencluck was down in her lab, putting on the finishing touches for her latest invention. It was a kind of laser gun - obviously not like those seen in sci-fi films, but rather for non-violent reasons. The rest of the Danger Agency had known that she was going to construct it, and now Colonel K had ordered Danger Mouse and Penfold to go to Squawkencluck's lab to view it and be taught how to use it.

"So, what exactly is this, Professor?" DM pondered out loud.

"This, Danger Mouse, is my Expansion Ray!" she responded excitedly. "It's used to make anything it's fired at grow to twice its size."

"That sounds great, Professor, but what use would it be on our missions?"

Squawkencluck gave DM an annoyed stare, not appreciating how he was so quick to question her latest invention. "Well, it's so that you can ... erm ... well you ... never mind. How about one of you try it out!"

She passed the Expansion Ray to Penfold and pointed to an apple sitting on a table. Penfold pointed the Ray at the apple and pulled the trigger. A laser was fired out of it, hitting the apple, and covering it with a glow. After a second, the apple slowly expanded to twice its size.

"Wow!" Penfold exclaimed in amazement. "I didn't know you could build that, Professor!"

"I don't know why you're surprised Penfold," DM responded. "She's shown that she can build pretty much anything."

"And an apple this big would be much healthier for you than ten jam sandwiches, Penfold!" Squawkencluck joined in.

Penfold grumbled to himself, not being interested in eating more different fruits.

"My turn!" DM suddenly shouted, pulling the Ray out of Penfold's hands. He then fired it at a plastic test tube on Squawkencluck's desk. Naturally, a glow covered the tube, before slowly growing to twice its size. The test tube was already hanging over the desk, so after DM made it expand it lost balance and fell on the floor rolling across.

"I wish you'd be careful with that, Danger Mouse," Squawkencluck muttered in annoyance. "Besides, how do you know I wasn't going to use that test tube in the future?"

"You've probably got lots of test tubes, Squawk. You could spare one of them, couldn't you?"

Squawkencluck simply shrugged and turned back around to start working on her next project.

"Anyway, we'd better see the Colonel now. I believe he needs to tell us about a new mission. See ya!"

DM and Penfold started to walk away from where they were standing ... only for DM to stand on the enlarged test tube. He promptly slipped on it and fell to the floor. As he hit the floor, he accidentally pulled the trigger on the Expansion Ray, which fired it directly...

... at Squawkencluck's bottom.

"Ouch!" She screamed, feeling a quick burn on her rear end from where the laser hit it. "Danger Mouse, what did I tell you about being careful with that?"

"Sorry, Squawk," he responded, getting up from the floor. "No harm done, was there?"

Suddenly, Squawkencluck's bottom glowed for a second, and then a strange gurgling sound came from it. And THEN, her rear end slowly started to expand...

"Danger Mouse, WHAT HAVE YOU DONE?!" she angrily shouted as her bottom continued to inflate. DM couldn't help but try and hold back a laugh. Her bottom kept getting bigger and fatter, and much to Squawkencluck's embarrassment, her trousers ripped and the elastic in her underwear snapped (thankfully her lab coat covered her up). Her bottom kept growing until it was twice the size of what it was before. Her bottom was no longer normal sized, but now was a large hump sticking out from the back of her, looking like a Victorian bustle!

And finally, just as things couldn't get more embarrassing, her newly large bottom let out a loud fart! (Perhaps to indicate that it finished growing.)

Squawkencluck waited for her bottom's fart to end, and then gave a very unamused stare at DM, with her eyes darting down at her newly overweight behind. Penfold stared at it in horror. DM couldn't hold it in any longer and burst out laughing.

"Oh, Professor, I am ever so sorry! Maybe you could use a Shrink Ray to return it to normal size?"

"I don't have a Shrink Ray, Danger Mouse, and I was never even planning on building one!" she angrily fired back.

DM felt dreadfully embarrassed at what he had done, and even Penfold was looking at him unamused.

"We'd better head up."

He promptly took Penfold by the wrist and ran out of the lab.

Squawkencluck stood there, glaring at them as they ran out. After a few seconds, she took another look at her bum, before walking to a shiny reflection in her lab to get a better look at it. She lifted the back of her lab coat, and there was a giant hole in her trousers, with her underwear showing through. They just couldn't contain a bottom that large. She dropped her lab coat down and made a note to get new trousers and underwear.

"From this day on, Danger Mouse, you'd better be REALLY careful with my inventions!" Squawkencluck said to herself. "And you know what? I'm going to keep my bum this fat as a permanent reminder of what happens when you mess with them!"