Sadly, there may not be a third season. It's too early to tell. Mike Young Productions and Taffy Entertainment, the primary companies that produce and distribute the series, have already fulfilled their obligation to Creepie. The original order was for 52 episodes--but each 15 minute segment is considered one episode, so the order has been filled and delivered. In order for a third season to materialize, either Discovery or Nickelodeon (which runs the show in other markets) would have to place an order. The chances of this happening now are completely up in the air. Creepie performed much better than she was expected to for edutainment, which is both a blessing and a curse. The good news is that it puts her in demand, but the bad news means that the demand might actually scare off investment in further episodes as this almost always leads to a price increase.
Did you know that each 15 minute episode of Growing Up Creepie costs approximately $300,000 to make? That's actually very cheap for animation, but think about it. If you won the lottery for a million dollars, you would have maybe enough money to fund three 15 minute episodes of Creepie. Scary, isn't it?
Assuming that Discovery is either planning to order, or has already ordered, another season of episodes for Creepie, it's unlikely that we'll be seeing them for awhile, at least not until into 2009. I've scoured the web looking for information on Creepie's renewal or cancellation and come up with nothing, so I'm guessing that the decision hasn't been made yet either way. All we can do now is sit and wait...and hope.