The Menons are evil dangerous monsters that may seem innocent and cute on the outside, but are ugly on the inside.
In Fantasy Zone, the Dark Menon Force steals money from planets in order to construct a fortress in the Fantasy Zone. Unfortunately, Opa-Opa stops their plans and destroys the invaders. In the ending, it's revealed that O-papa, Opa-Opa's father, is the leader of the Menons.
Fantasy Zone II: The Tears Of Opa-OpaEdit
In Fantasy Zone II, the Menons return to invade the Fantasy Zone and are once again stopped by Opa-Opa. As the ending reveals, the true mastermind behind these creatures is none other than Opa-Opa's dark side.
- In Segagaga, some Menons appear as attack waves for the last boss.