Spongebob 25 Year Anniversary. Nickelodeon animation is celebrating 25 years of cartoon success with series like ‘spongebob squarepants,’ ‘rugrats’ and more. Nickelodeon is celebrating spongebob squarepants' landmark 25 th anniversary with a panel that will take fans down to bikini bottom and beyond for a.

Nickelodeon’s iconic spongebob squarepants celebrates its 25th anniversary this year as one of the most popular animated series ever. Nickelodeon is celebrating spongebob squarepants’ landmark 25 th anniversary with a panel that will take fans down to bikini bottom and beyond for a.