What are your favorite Nickelodeon original series? Mine are:
-Hey Dude
-Salute Your Shorts
-Space Cases
-Welcome Freshmen
-Fifteen (a "Nick" soap opera)
-Ren & Stimpy

:mrt: :dance: :ufo:

Good question...

Hey Dude
Salute Your Shorts
Clarissa Explains It All
The Adventures of Pete and Pete
The Secret World of Alex Mack
Gullah Gullah Island
Eureeka's Castle
Kenan and Kel
My Brother and Me
All That (older ones with Lori Beth Denburg)
Figure it Out

and probably more but can't think of them at the moment.

These were the best I thought:
~ "Ren and Stimpy"
~ "Rugrats" from the early 90's
~ "David the Gnome"
~ "Salute Your Shorts"
~ "Fifteen"
~ "Family Double Dare"
~ "Nick Guts"/"Global Guts"
~ "What Would You Do?"
~ "Nick Arcade"
~ "Legends of the Hidden Temple"
~ "All That"
~ "My Brother and Me"
~ "The Amanda Show"

You Can't Do That On Television
Hey Dude
Fifteen
Clarissa Explains It All
Mr. Wizard's World
Out of Control
Double Dare
Rated K For Kids
Kids Court
Total Panic
Special Delivery
Pinwheel