First, Lala's arrival alone, okay... so King Gid wants an Heir for the throne, pretty understandable (and Truth in Television)... until you realize that Interspecies Romance is in their way. Sounds hopeless? No, Lala has been known well with Gadgeteer Genius tendency and able to turn male-into-female in a snap. That alone proves HOW ADVANCED Devilukean science is in terms of genetic engineering, it's either Lala turned into her husband species or said husband turned into a Devilukean...
Second, Gid's threat. No matter how comedic that chapter is started, he's definitely damn serious. Why? He's been involved in a large scale interstellar war to the point his body shrink, Insignificant Little Blue Planet indeed...