When Detective King Julien searches for a missing Butterfish, he notices lemurs acting strange all around and realizes he has a serious mystery on his hands, so he must get the Mystery Solving Team back together.

When a crate of "PURE ORGANIC IMPOSSIBLY SAFE ORGANIC NUTRIENTS" washes onto shore, King Julien accidentally overfeeds the crops, creating a giant mango that tries to take over the world.

When King Julien and the gang bury Sage for his bachelor party, things don't go according to plan and they must deal with Franken-Sage.