Nickelodeon is commissioning three separate pilot concepts for proposed RUGRATS spin-off series. The first of the three spinoff ideas features spunky next-door neighbor Susie Carmichael and troublesome tike Angelica Pickles in pre-school. The second has Susie and her family moving to Atlanta to live with Grandma Carmichael and help her run the family restaurant. The third possible spinoff continues the adventures of the Rugrats as "tweens" as seen in the upcoming 10th anniversary special "All Growed Up," which debuts on July 21 at 8 pm. "RUGRATS is THE SIMPSONS of kids TV, and the series will continue to bring viewers great stories in its original format," said Cyma Zarghami, executive vice president and general manager, Nickelodeon. "As kids have connected with these characters over the past 10 years, they have told us that they love seeing their heroes in new and different situations. This milestone is the perfect time for us to explore other adventures in different settings, and these concepts give us three great directions to pursue."Sixteen new episodes of the original RUGRATS series, produced by Klasky Csupo, will premiere on Nick this fall.