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Got a list I made myself of ones that are at least worth a watch.
* means it is pre-movie material, the bulk of which are in Season 4. I haven't actually seen EVERY episode of post-movie Spongebob (there's an autist on YouTube doing that) but out of the ones I've seen these are my picks.
Season 4:
>Skill Crane *
>Krusty Towers *
>Mrs. Puff, You're Fired *
>Wishing You Well
Season 5:
>The Original Fry Cook
>Krabs a la Mode *
>Roller Cowards
Season 6:
>Sun Bleached
>The Slumber Party
>Overbooked
>Sand Castles in the Sand *
>No Hat for Pat
Season 7:
>I Love Dancing
>Growth Spout
>Greasy Buffoons
Season 8:
>Frozen Face-Off *
>inSPONGEiac
Season 9 (bump in animation quality, looks actually pretty great):
>Eek, an Urchin!
>Plankton's Pet
>Sold! *
Season 10 (current season, I haven't watched all of it):
>Mimic Madness *