The Red Poppy's presence.

There is a red poppy that only sprouts in a forest when a blood moon occurs. It has the power to give a power manifestation to the one who uses it and also grants them temporary youth. Of course, there are greedy ones. Because the one and only red poppy is taken by Richard to heal Nicole before she gives birth to Gumball who inherits the poppy's powers, an old witch lady wants the red poppy's power to stay young for hundreds of years. But because having the power for yourself in your own hands cannot last on it's own, she has to kidnap the young blue cat during a governmental invasion so she can stay young forever with his power.
The old lady, better known as Elizabeth Darrens, raises Gumball to be a happy boy and keeps him secluded in a cave where no one will find him. Twelve years later, he encounters a goldfish robber named Darwin Caspian going by the name Raglan Poseidon who is seeking refuge from robbing at Elmore for some money. Since Elizabeth won't let Gumball outside, Gumball convinces Darwin to take him on a journey outside so he can see the blue floating lanterns. But what happens when Elizabeth finds out that his "flower" has disobeyed her orders and went to enjoy the outside?
Based on the fan fiction The Power by ImaginationStudios8, this is a lovely fairy tale between two boys that will soon find the new dream they have really wanted. With adventures and obstacles along the way, it'll be a while before true happiness will come.