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Determined April O'Neil eyes a glowing mutagen canister in the lab

April O'Neil in a yellow jumpsuit smiles slyly while holding a glowing green mutagen canister in an underground lab — April O'Neil wonders what would happen if she poured the turtles' mutagen over herself — the cover of April Muscle Up!, an AI 3D muscle growth comic.

Read the comic →From part 1 of April Muscle Up!. The comics are for readers 18+.

Red-haired woman in a yellow jumpsuit smiles slyly while holding a glowing green mutagen canister in a lab, with a thought balloon. April O'Neil is done being rescued. She has a canister of mutagen. The picture comes from April Muscle Up!, a photoreal 3D muscle growth comic made with AI tools by 3DMuscleComics.

Character: April O'Neil (Teenage Mutant Ninja Turtles fan art)
Comic: April Muscle Up!
Image: 1200 × 2150 JPEG, AI-generated 3D art
Credit: © 2026 3DMuscleComics.com · licence & reuse

More April O'Neil

A huge vein-covered bicep and fist burst through the torn sleeve of April O'Neil's yellow jumpsuit, slick with green slime

Jacked April O'Neil's giant bicep tearing through her jumpsuit sleeve

Grinning Irma Langinstein in glasses and a blue sweater with bulging arms flexes in a green-lit TGRI lab.

Strong Irma flexing in the TGRI lab as her sweater strains

All 3 April O'Neil pictures →

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