"Peanut!" Scott Lang grinned from ear to ear as he threw his arms around his daughter, the twenty year-old Cassie Lang finally home from college on spring break. "It's so good to see you."

"Hey Dad," Cassie greeted with a laugh, wearing a red hoodie over a white t-shirt, jeans and sneakers. "I missed you."

"I missed you too. Pym!" Scott shouted up the stairs "Come downstairs, your big sister's here!"

"In a minute!" the little boy responded.

"How is Pym?" Cassie asked "He hasn't called me in a while."

"Blame Hank. He gave Pym a puzzle or something last week," Scott explained "He's been working on it non-,"

BOOM!

Scott and Cassie jumped as an explosion went off upstairs, causing the Ant-Man to quickly shield his daughter with his body.

Cassie gasped. "What was that?"

"I don't know. Pym!" Scott shouted "Pym, you okay?"

"I did it!"

At that moment, Henry Pym Lang came barreling down the stairs, a massive smile on his face the five year-old came into view.

He was small boy, with messy dark hair and big brown eyes, wearing a dirty white lab coat over a bright yellow t-shirt and jeans, a pair red goggles that were two sizes too big covering his face.

"Why does my baby brother look like a mad scientist?" Cassie whispered.

"He does not," Scott tilted his head he examined his son "Well…,"

"I did it Daddy!" Pym repeated. The little boy grabbed his father's hand and ran back up the stairs, leading Scott and Cassie into his bedroom.

Pym's room was a tribute to science. Hanging over the bed was a model of the solar system, with the Guardians of the Galaxy's ship flying past Mars. On the left wall of the room was a beehive made of lego blocks, sitting on the windowsill. And on the far back wall was a massive homemade chemistry set, made of glass jars, rubber bands, tupperware containers, hotplates, cleaning supplies, and cooking oils.

Scott's eyes widened as he noticed the giant teddy bear in the corner. Tony Stark bought one for everyone of the Avengers' children. Only Pym's had somehow gotten bigger. And punched a hole right through the roof.

"Dad?" Cassie drew Scott's attention to her little brother's bed, where a mountain of old papers lay scattered across the Star Wars covers. "Isn't this Hank's handwriting?"

The Ant-Man's eyes widened as he looked over the sheets, the old and weathered papers covered in long numbers and equations, written in black ink. He had seen these papers before. "Pym, is this the puzzle Grandpa Hank gave you?"

"Uh-huh," the little boy confirmed with his back to his father as he played with his chemistry set, filling a blue water balloon with a glowing liquid from a glass jar. Pym beamed with excitement as he ran over to his bed, pulling out a soccer ball from underneath. The little boy set the ball in the middle of the room and backed over to his father and sister's side, hefting the water balloon in his hand. "Watch this."

Pym threw the balloon directly at the ball, the rubber projectile bursting the second it made impact with the ball, splashing the glowing liquid across the ball.

POP!

In the blink of an eye, the soccer ball multiplied in size, now standing as tall Scott Lang himself, rolling across the room and bumping into the windowsill.

"Oh. My. God." The Ant-Man's eyes nearly fell out of his head as he whipped out his phone, rapidly dialing his father-in-law's number, muttering under his breath "Pick up, Hank. Pick up!"

"Hello?"

"Hey Hank," Scott greeted, trying to keep his voice calm "It's Scott. Quick question, did you give Pym a copy of your Pym Particle research?"

"Yes I did. I caught little Henry trying to take apart one of my old suits in the garage last week," Hank explained "I didn't want to stunt his scientific curiosity, so I gave him my old research notes."

"Interesting. Interesting," Scott repeated with a racing heart "did he happen to tell why he wanted to take the suit apart?"

"You're not going to believe this," Hank said with a chuckle "He said he wanted to make his own suit. Shrink down and explore the Quantum Realm. Isn't that cute?"

Scott's eyes widened as he watched his son reach into his closet, pulling out a cardboard box, the words "shrinking suit supplies" written on the side in crayon. "Yeah, real cute."

"I told him I'd help him build it once he understood the formula. Thought it might give him a reason to see his old Grand Dad now and then once he's a teenager. Kids don't stay little forever, you know."

"Wow, Hank. That's a really lovely thought," Scott complimented "Nice way to make some memories, keep the family legacy alive. There's just one problem: He cracked it."

"What?"

"Your five year-old grandson recreated your Pym Particle formula," Scott repeated slowly "In a week. Using things he found around the house!"

"That's impossible."

"Oh yeah?" Scott quickly tapped at the screen of his phone, ending the call and starting a video chat. "Hey Pym, I got Grandpa on video chat. You want to show him what you learned today?"

"Yeah!" The little boy's face lit up as he grabbed a water gun from under his bed, filling the tank a glowing red liquid "Watch this, Grandpa." Pym's smile grew almost too big for his face as he hefted the gun with both hands, aiming it at the ball as he pulled the trigger.

POP!

The red liquid shot out from the gun and landed it on the ball, turning it back to its regular size in mere seconds.

Hank's jaw went slack. "Oh my God."

Scott gave the original Ant-Man a glaring look. "Did you see it?"

"I saw it. But I don't believe it. Henry, how did you do this?" Hank asked, once his grandson was in the screen of the video chat.

"I followed your clues, Grandpa."

"And you did all this by yourself?" Scott asked "No one helped you?"

Pym shook his head. "I wanted to do this by myself."

"I can't believe it."

"I can," Cassie commented, earning a look from her father "Who do you think helped pass advanced physics last year?"

Scott's eyes widened as he remembered Pym sitting at the kitchen table as he and his big sister talked via video chat, an act the two Lang children affectionately called Skype study sessions. "I thought you were teaching him spelling words!"

"I did. And he helped with me advanced physics."

"It's easy," Pym commented.

"Easy," Scott repeated "My five year-old son thinks that college-level physics is easy!"

"Daddy, can we have dinner at Grandma and Grandpa's?" Pym asked "I want to start working on my suit."

"Uh, we may have to put a pin in the whole suit-building thing, buddy."

"But Grandpa promised he'd help me make a suit!"

"I know. I know, buddy. But the Quantum Realm isn't really a place for little kids."

"But he promised!"

As Scott and Cassie tried to calm down the little boy, a bee from Pym's homemade hive crawled out from its habitat, the lid having come loose when the enlarged soccer ball bumped into windowsill. The bee stood on the edge of the lid and then flew down onto the ground, taking a sip from a glowing blue drop on the ground.

POP!

Cassie screamed at the top of her lungs as a bumblebee the size of a guard dog appeared behind her father, its giant, buzzing wings filling the air with the sound of a small helicopter.

Scott quickly turned around at the buzzing sound filled his ears, his eyes widening as the giant insect appeared at his eye level, baring its massive pincers. The Ant-Man ducked as the bee swooped down just past his head, its long stick like legs brushing against his hair. "Run kids!" He shouted.

The ex-convict lead his daughter back downstairs, the bee buzzing after them without hesitation, swooping down in front of them, cutting off their path to the front door. Cassie felt a nervous whimper leave her lips as she clutched her father's arm for dear life, trying remember why she ever thought giant bugs were cute.

"Stop!"

All eyes turned to Pym as he spoke, the little boy holding his shrinking water gun in one hand and a halloween astronaut helmet on his head, with a pair of old TV antenna tapped to the back, along with wires, circuit boards and the top half of a microphone. The little boy jabbed a finger at the giant bee, speaking to it as if it were a misbehaved pet. "Down," he ordered.

The bee obeyed, slowing lowering itself to the ground while Scott and Cassie watched in awe.

"Stay," Pym instructed, slowly approaching the bee as he aimed his water gun.

POP!

With one squirt, the bee was returned to normal size, buzzing around in the air until it landed on Pym's finger. The little boy smiled. "Good Beatrice."

"You can control bees? Since when can you control bees?" Cassie demanded.

"Since yesterday," Pym answered "I'm going to teach them tricks."

Scott jabbed a shaking finger at both of his children. "Not one word of this to your mother. Either of them."