I suggested that it would make for a very interesting episode indeed if Franklin got a new friend called Chupacabra:

"Franklin, Mom and I don't think you should play with Chupacabra anymore."

"But Dad! Chupacabra is the coolest kid in school! I mean, his teeth are weird and he drools a lot, and Goat won't come around anymore when we hang out together, but still, he's really neat."

"I'm sure he is, Franklin, but we just don't think he's a good influence. You'll need to find other friends to play with."

"Awww."
The next day:

"Hey, Chupacabra ... I hope this won't hurt your feelings, but my dad says I can't play with you anymore."

"RRRAAARGGHHHSSHHHNNNGGGHHLLAAAAAAAH!"

"I'm really sorry. I hope we can still be friends."

"GNNNNNHHHSSHHRARRRGH! RAAAHH!"

"Well, I guess I'll see you around. Good luck with the baseball game next Friday."
Next Friday:

"Franklin! Franklin! Did you hear? Chupacabra ate Goose!"

"Oh no! Why?"

"I dunno. One minute we were playing baseball, and then it was all honking and hissing and feathers flying. It was terrible."

"Wow. I guess Dad was right about Chupacabra. Thanks, Dad!"

"Well, son, that's what Mom and I are here for. Sometimes we may ask you to do something you don't want to do, like going to bed or brushing your teeth or not playing with a bloodthirsty goat-sucking monster. But we do it all because we love you."

"I love you guys too."
Hugs all around. Credits roll.
G has a slightly twisted sense of humor (gosh, I wonder where she got it) and is fascinated by the legend of el chupacabra, so she found this hysterical -- in fact, it was her idea for Chupacabra to consume one of the other animals. Somehow I doubt it would appeal to the preschool set, though, so I think we'll pass on sending a script treatment off to Noggin. Hee.