The Prince Imperial's Dark Love - S1.E30

Sincline is haunted by a recurring dream in which his mother calls out to him only to be attacked by a demon. The Prince demands to know the truth about his mother from Emperor Daibazaal who is insisting Sincline marry Princess Sahlia from the Planet Galleria. Sincline decides he can have more than one wife and attacks Fala with a magic knife that sends her into a deep sleep. Believing her to be dead, the GoLion team vow revenge on Sincline.