Sheldon J. Plankton

Plankton was working on creating yet another machine to get revenge on Mr. Krabs... As always. This time, he had a brilliant idea: A giant heat-ray made specifically to destroy Krabs. He took a brief pause to observe his own work, his red eye shining with pride before a mischievous grin replaced it.
"Hahaha! Yes, finally! With this lethally heat-ray, the Krabby Patty secret formula will finally be MINE!!" Plankton spoke to no one in particular, his tone loud and enthusiastic to have finally finished yet another evil project.
"Now, I just have to test if...-" He continued, rubbing his tiny hands together while slyly narrowing his eye – approaching the heat-ray to begun testing it. He positioned so it would be directly facing the Krusty Krab's direction, before pressing the obvious red button placed right by the rear of it. The machine immediately begun to start functioning, just as he has planned!
... Yet, a sudden crack noise came out of the ray – a strange coloured smoke begun to spread through the air (water, technically) and invade Plankton's senses, which, in the end, made him fall unconscious.
On the same day, now late at afternoon, Plankton openedhis eyes again – his consciousness returning slowly.
"Uugghh... My head..." Plankton grumbled, his vision being slightly blurred. He reached one of his hands to scratch his head, yet once he felt the texture of something silky – something rough, as if touching grass directly – he froze.
Slowly, he lowered his hand until he was facing it, his eye widening in shock. His skin wasn't green, nor were his hands tiny and lacking fingers. Those weren't the copepod hands that he was used to... Those were HUMAN hands, big, large and overly detailed, hands of humanoid creatures.