A brief paragraph from Apple’s writeup:

“Bloody Sundae” is just one of many missions that await you in Galactic Adventures, which extends SPORE’s space stage with new stories created by you and your fellow gamers. Just as you can build and share creatures, buildings, vehicles, flora, and music, now you can terraform planets, design adventures set on them, and let everyone enjoy the fruits of your labor through the SPOREpedia.

article here