"With the Sun-Pak, just one hour of sunlight can provide an Autobot with all the energy he needs for a full day," says Optimus Prime. "You are a genius, Sparkplug!"

"I'm just a good mechanic," the human says modestly.

"This could be the end of our constant search for fuel," Optimus Prime goes on. "It could be the key to defeating the Decepticons!"

At the mention of the Decepticons, buster cannot help shivering. He is proud of his father. But he knows how evil the Decepticons are.

"He still has forty minutes to go," says Optimus Prime.

What he doesn't know is that time may be running out for the Autobots.

Unknown to the humans and Autobots, they are not alone in the cave. Kickback, the evil Insecticon, has been waching and listening. The grasshopper-like being also realises how valuable the Sun-Pak could be.

The Decepticons must have this battery, he thinks to himself. Megatron will reward me well!

Continue.