A green smurf looked back at him in the mirror,

"Ah man, I don't think what I smoked was weed last night."

This is Shaggy. Part of the mystery solving gang, and he had green skin.

"Scoob, buddy, tell me I'm not high right now."

Scoob poked his head in the doorway, "Raggy."

"Yes?"

Scooby blinked, "You're green."

Shaggy rolled his eyes, "I know that, Scoob. I'm asking you if I'm high right now."

"Oh...! No."

Shaggy scrubbed his face with one hand and grabbed Scoob by the collar.

Scoob looked up at him, "Where are we going, Raggy?"

"Velma's."

The rest of the gang was at Velma's, apparently. Daphne talking about boy problems, and Fred sketching traps.

The two sauntered in.

"Hey, you two."

"Hey, Fred-o. Notice anything different?" Shaggy combed his fingers through his hair.

"New hair-cut?"

"Wha--Pff--No? What? Can you not see my skin?! It's GREEN."

Fred blinked. "I'm colour-blind, Shaggy."

"Oh..."

"...Anyhoo," Shaggy continued, "The pot I smoked last night must've been somethin' else, like, any ideas what happened, dudes?"

Daphne looked up from her seat, "You are what you eat."

"I did not eat my mary jane, Daphne!!!"

Velma's eyebrow rose, "I don't know, Shaggy, that Mary Jane seemed very in to you."

"O-Ho-ho-ho," Shaggy walked around and pointed his hand at Velma, "I did not swallow her, Velma, in fact, it was the other way rou--"

"Okay, gang! Let's just get to the fact that Shaggy's green and he doesn't like it. Velma, any theories?"

Velma swerved in her wheely chair and faced the rest of the group, "Well, did you happen to eat anything on our investigation last night?"

Shaggy's eyes drifted as he clearly remembered eating something in a barrel that even Scoob wouldn't touch.

That was probably a dumb idea.

"No."

Velma's brow line climbed up suspiciously.

"No? Nothing.. Green... or gooey. Probably tasted like paste--"

"Alright!" Shaggy threw his hands in the air, "I ate something. Was it really that bad?"

Scooby nodded. "Res, res it was."

"Do you happen to know why we were investigating the warehouse, Shaggy?"

"Umm," Shaggy said like it was obvious, "Spooky man bad?"

"No, Shaggy," Velma continued, "The man we were clueing into goes by the name of Ven Schwartz.

"He's famous for his research on greenhouse gases and for being an extreme vegan enthusiast. His ideals have always been strong and he's sure to voice his words where and whenever he can. One of his ideas is creating some sort of human-plant hybrid,

"An abomination.

"These organisms would live by sunbathing constantly, allowing themselves to produce their own food and cleaning the air via their photosynthesis.

"Basically the cure to world hunger and getting rid of the greenhouse effect."

Fred and Daphne were leaning in.

"However," Velma continued, "The government didn't give him permission to hold his study on human plant mutation, worrying that any change to animal cells would mess up the creature tested on on a molecular level, leaving the creature to permanently handicapped are damaged.

"Schwartz, not caring that it was illegal, started testing on people on the streets and/or his lab for the purposes of 'a greater good'.

"At least, that's what the police gathered. We're researching to confirm the theory."

Shaggy wolf-whistled. "Woo, that man has got way too much time on his hands."

Daphne nodded her head in agreement.

Fred clicked his pen and set it off to the side, "Thing is, how do we get shaggy back to normal?"

"Thing is," Velma turned around to type on her keyboard, "How do we get Shaggy to survive right now?"

Scooby hopped up to Velma's side.

Shaggy followed.

"Are you saying that I'm, like, gonna die?!?"

Velma shook her head, "No, no.. I'm saying that although you seem fine, you, at base, are a plant. Bend your knees, Shaggy."

Shaggy crouched down to Velma's height.

Velma navigated her fingers between the knots in his hair.

"In case you haven't noticed, his scalp is hosting roots, not hair."

"AAA!" Shaggy leaped up and frantically combed his scalp, "What?!"

Fred walked over and got in his tippy toes, "Ohhh, that is weird--" plucked a root, "--it's sorta hard recognizing it, seeing that it doesn't have any dirt." And twisted the strand around in his hand.

"FRED. I am not a... a thing you can look just look at!"

Fred raised his eyebrow.

Velma separated the two, "The point is is that before we figure out how to turn him back to normal, we must find out how to sustain him. It'd be pretty pointless to use an antidote on a corpse."

Daphne's brows furrowed, "Woah, Velma, a little dark."

"Well, it's true! Would you really think that'd work. No. No, it wouldn't."

Scooby rested his paws on the desk, "Rell, how do we do rit?"

Velma continued on her explanations. Expanding on the complications and simplifications of Shaggy's diet. Shaggy was relieved to find out he would still eat.

"In short, Shaggy's a walking venus fly trap.

"Energy will be provided to you as long as you sunbathe often, and eat every week or so. Since your cells have both chloroplasts and mitochondria, avoiding eating or sunbathing entirely is a poor choice, since both parts of your cells need energy.

Have fun."