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Squidward Tentacles is one of the main characters in the animated television series, SpongeBob Squarepants. He makes a few appearances as a minor background character in the SMG4 series.
He first appeared in R64: Mario's Spageti Delivary as a hallucination.
He makes a minor appearance and is seen among the many dead contestants in ♫ The Ultimate Smash Bros ♫.
He made a minor appearance as a music teacher in Mario's EXTRAS: High School Mario.
Multiple Squidwards appear as enemies in second round of the Tower Defense match in the Final Splatfest in SMG4 Movie: Meggy's Destiny.