Plankton! (Episode)

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Plankton!
Episode No.:	3b
Airdate:	7.31.1999
Season:	Season 1
Previous Episode:	Jellyfishing
Next Episode:	Naughty Nautical Neighbors

"Plankton!" is an episode from Season 1

Info

patrick kills spongebob

This is the first appearance of Karen and Plankton, and also the second episode Doug Lawrence voiced in. The first was Ripped Pants.
SpongeBob's laugh is very different in this episode.
SpongeBob's line to Plankton when he is in his brain, "Leave my brain alone!", has become a staple on T-shirts and in pop culture for media manipulation.
When SpongeBob is walking towards his pants, the tie is red, but when the pants are just under his nose, it is black. This also happened in the episode Rock-A-Bye Bivalve.
Squidward's bedroom is on the first floor of his house instead of on the third floor.
In addition, this episode depicted Patrick's rock hollow and that Patrick slept on the rock rather than under it.
Plankton changes sizes throughout the episode. When he is first seen, a magnifying glass is required to see him clearly. When he encountered SpongeBob, he's about the size of SpongeBob's finger. When he sneaks into SpongeBob's brain, he's about the size of a walnut. Then when he jumps to the Krabby Patty, he is the size of SpongeBob's finger again.
In this episode Spongebob's mattress is fill with flowers, but in other episodes his mattress is blank.
SpongeBob's brain doesn't have a brain stem!