"Transformers: Energon" is an animated television series that is part of the larger Transformers franchise. It aired from 2004 to 2005 and is set in a future where the battle between the Autobots and Decepticons continues. The series focuses on the quest for Energon, a powerful energy source essential for the survival of the Transformers. The storyline features both new and returning characters, including Optimus Prime and Megatron. The series introduces the concept of combining Transformers, allowing them to merge into more powerful forms. "Transformers: Energon" aims to appeal to both children and long-time fans of the franchise.