Tomorrow, August 11, marks the 20th anniversary of Nicktoons! Prior to 1991, Nickelodeon aired mostly foreign-made animated series’. On Sunday, August 11, 1991, Nickelodeon premiered the first three self-produced cartoons: “Doug,” “Rugrats,” and “The Ren & Stimpy Show.”

To this day, there have been 37 Nicktoons – with the most recent being “T.U.F.F. Puppy.”

To celebrate the 20th anniversary, TeenNick’s “The ’90s Are All That” website has deemed this week “animation week” and has uploaded full episodes of your favorite shows like “Aaahh!!! Real Monsters,” “Rugrats,” and “The Ren & Stimpy Show.” You can check out all of the episodes and clips here.

Which Nicktoons are your favorites? How do you plan on celebrating?

Great anniversary logo above thanks to Coonfoot.

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