The story takes place on the planet Elementros, which has unknown powers. The main character, Optimus Prime, follows his friend Megatron and lands on this planet.
There, Optimus meets Lightlong, a giraffe-type Transformer who is an energy beast. According to Lightlong, the energy beasts that live on Elementros in the form of animals and dinosaurs have five elements of "element energy" hidden within them: fire, water, earth, nature, and lightning. Suddenly, Megatron attacks. Optimus and Lightlong use the power of their bond to awaken the ability to transform and combine [Wild King]. Optimus joins forces with the animals, and Megatron commands the dinosaurs. What will be its fate?!

(Source: Youtube)