Matt is riding on the kitchenbot's right shoulder; Salamandastron is sitting on the bot's left shoulder, and Wolves is holding on to the kitchenbot's back.
On the way to the gardening section, the bot suddenly stops. "What is it?" Matt asks, as the three disembark.
The kitchenbot points, and Matt immediately understands. They are in the toys section, and the bot is pointing directly at an Optimus Prime toy.
Matt rips the toy out of its packaging and throws it at the robot's heart. With a loud "F'TAAAANG" sound, the toy attaches itself.
The entire supermarket shakes as the transformation occurs. Pots and pans morph seamlessly into each other, forming full-bodied arms and legs. Metal pieces fly from halfway across the supermarket, slamming into the bot and adding to its mass. The bot seems to rotate in on itself for a bit, then components snap into place with a terrific noise.
After this badly-described spectacle is complete, a full-sized Optimus Prime stands before them.
"Greetings, humans. I am Optimus Prime, leader of the Autobots. We seek the Energon." Optimus brings his head, which is by itself six feet tall, directly in line with Wolves. "Do you know where the Energon is?"
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