The first chapter involves Lisa asking Lincoln to see her new invention. It turns out she's invented a shrink ray and Lincoln's a bit dubious as to how it would work, so she demonstrates. It takes a while to start up, so Lincoln gets impatient and ends up being shrunk. She decides to keep it a secret from their parents and reveals that she can grow him back, but not until the next morning. Lisa then carries Lincoln out in her pocket to talk to Lucy and the twins.
In the second chapter, Lisa shows Lincoln to Lucy and the twins and Lana teaches Lincoln how to feed her pets. It goes well, except for El Diablo, who tries to eat him.
In the third chapter, Lucy is stuck because she has to write a poem describing what it's like to be scared. Lincoln uses his experience nearly being eaten by El Diablo as inspiration, which doesn't work very well so (after giving him lunch), Lucy deliberately scares him for inspiration by giving him empty threats.
In the fourth chapter, Lincoln has a pretend tea party with Lola and they pretend to deal with a doll who's prejudiced against elephants. After the tea party, Lola admits she has no friends and Lincoln reassures her that she will make friends.
In the fifth chapter, Lincoln and his younger sisters form a club to pass the time and they swap secrets.
In the sixth chapter, the sisters come up with an excuse for Lincoln not being at dinner (he's sleep deprived from studying at night) and give him dinner. He sleeps in Lisa and Lily's room and cheers Lily up from a nightmare.
In the seventh and final chapter, Lincoln gets grown back.
Shrinkin' Lincoln provides examples of
- Actually Pretty Funny:
- When Lincoln finds out that Lucy scared him on purpose to write her poem about fear, he actually laughs.
- When Lola laughs at Lincoln kissing her toy cat Duchess, he eventually laughs too.
- Afraid of Needles: Apparently Lana needs comforting whenever she has to get a shot.
- Animal Lover: Lana outright says she "can't get enough of [animals]."
- Big "NO!": Lisa says, "NO!" when Lincoln suggests telling their parents about him being shrunk.
- Big "YES!": Lana says, "Yes!" after it's decided she will be the one Lincoln sees to first.
- Blinding Bangs: Pointed out when Lincoln supposes that Lucy's eyes are popped but can't be sure since her hair covers her eyes.
- Bread, Eggs, Breaded Eggs:
- When guessing what animal Lana is afraid of, Lincoln suggests lions, Lucy suggests tigers, and Lola suggests ligers.
- When making excuses for why Lincoln can't come to the table, Lola says, "He's sick," Lucy says, "He's studying" and Lana says, "He's sick of studying".
- Bring My Brown Pants: Apparently the reason why Lola wet her pants at her first pageant was because she was nervous.
- Cats Are Magic: Lola claims that her toy cat Duchess put a magic spell on her doll's garden.
- Child Prodigy: Pointed out when Lisa's scientific achievements are stated to be unusual for a four-year-old.
- Comedic Spanking: When Lincoln raises his voice during the tea party, Lola makes Miss Bliss the rag doll doll "spank" him.
- Creepy Child: Discussed when Lincoln points out that it's especially scary hearing Lucy threaten to squeeze him as she's eight years old.
- Creepy Monotone: When Lucy threatens to squeeze Lincoln, he's especially scared by her deadpan voice.
- Deadpan Snarker: Lincoln is worried that Lisa will reply to his request to be grown back with "her usual condescending snark".
- Department of Redundancy Department: Lisa's excuse for Lincoln's absence involves him being "tired and fatigued".
- The Dreaded Pretend Tea Party: Subverted. At first, Lincoln finds the tea party very boring, but then he grows to find it more interesting when Lola's toy elephant is brought up.
- Eaten Alive: Some live crickets are fed to Izzy.
- Edible Theme Naming: Lola names her toy elephant Camembert.
- Elmuh Fudd Syndwome: Lily calls Lincoln, "Winky" and "Wink" and pronounces the word 'sorry' as "Sawwy".
- Lincoln loses consciousness when he first gets shrunk.
- Discussed when Lola tells the toys not to faint from Lincoln's cuteness.
- Faking Another Person's Illness: Lola's excuse for why Lincoln can't come to dinner is that he's sick.
- Free the Frogs: The time Lincoln and Lana saved frogs from being dissected in the canon episode "Frog Wild" is alluded to.
- Gender-Blender Name: Izzy the lizard is a guy in this story.
- The Golden Rule: When Lola's doll Miss Bliss is said to have not invited Camembert, and only Camembert, Lincoln asks how she would feel if she was the only one not invited to a party.
- Good News, Bad News: Lisa gives Lincoln good news which is that she can grow him back, but bad news that it won't be until the next morning.
- I'm a Doctor, Not a Placeholder: When Lincoln defines fear for Lucy's poem about it, she tells him she's a "poet, not a dictionary", which Lincoln considers pretentious.
- Incredible Shrinking Man: The whole plot of this is about Lincoln being shrunk.
- Inelegant Blubbering: Lola sobs loudly when she claims not to have friends.
- Interspecies Romance:
- Mentioned when Lincoln is having a hard time interpreting Tori the tortoise's expression and hopes it isn't infatuation.
- Lola pretends her toy cat is in love with Lincoln.
- Mad at a Dream: Lola claims her doll Miss Bliss is prejudiced against elephants because she dreamt one ate her crops.
- The Nicknamer: Lana calls her kid siblings (except for Lily) "Tiny Linc", "Prissy-Pants", "Egghead", and "Gloomy Face".
- Not So Stoic: Lisa, who's usually The Stoic, actually sniffles when she apologises for shrinking Lincoln and chuckles when Lily puts him in her diaper.
- Original Character: Lana has a tortoise named Tori.
- The Perfectionist: Lincoln describes Lola as a perfectionist.
- The Pig-Pen: Lana's "less-than-stellar hygiene" is mentioned with her wearing dirty overalls.
- Potty Failure: Lola's embarrassing secret is that she wet her pants at her first pageant at age three.
- Pun: Luan calls Lincoln the Missing Linc because she hasn't seen him all day.
- Referenced by...: An episode of Peeking Through the Fourth Wall has one of Lincoln's younger sisters mention "that time we shrunk him".
- Shrink Ray: Lisa invents a ray gun to shrink things, which is how Lincoln gets shrunk.
- Sleep Deprivation: Discussed when Lisa says Lincoln can't come to the table because he's tired from studying all night.
- Snakes Are Sinister: El Diablo tries to eat Lincoln and he's the only one of Lana's pets to antagonise him.
- Sophisticated as Hell: Lisa is said to have committed "what's known in the scientific community as a 'whoopsie'."
- Still Sucks Thumb: Lisa's embarrassing secret is that she sucks her thumb.
- Take That!: Lincoln and Lana dislike The Lorax.
- Why Did It Have to Be Snakes?: Apparently, Lana is afraid of squirrels.
- Your Makeup Is Running: Lola's mascara runs when she cries about not having friends.