Is it possible to do 4 Disney parks in a day [more inside]?

I would say if you wanted to try and do all the parks in a day it would be impossible to see everything. Since the parks are so big and you have so little time. But if you started in animal kingdom and did the rides there and then went over to epcot and ended in mgm then maybe you would be able to see at least a little of the parks that you wanted to go to. That is how I would try to do them all in one day.