One day, when Valkyrie was playing in her backyard, something strange happened. She suddenly felt a surge of energy coursing through her body, and she felt her skin start to tingle. She looked down at her hands and saw that they were glowing with a bright, blue light. 

Valkyrie was frightened and confused, but she felt a strange sense of excitement as well. She didn't know what was happening to her, but she knew that it was something special. 
The glow grew brighter and brighter until it was too bright to look at directly. When it faded, Valkyrie looked down at herself and gasped in amazement. Her body had transformed into a Cybertronian form, just like the Autobots.

She had a teal metallic armour covering her body and her hands had transformed into powerful, robotic claws. She looked up at the sky and saw that she had grown to the size of the Autobots. She felt stronger and more powerful than she ever had before.

The Autobots sensed the transformation and rushed to Valkyrie's home to see what had happened. When they arrived, they were amazed to see the young girl transformed into a Cybertronian. 

Optimus Prime approached Valkyrie cautiously, "Valkyrie, what has happened to you?" he asked. 

"I don't know," she replied, still in awe of her new form. "I just felt this energy inside me, and then I transformed."

The Autobots were amazed and a little bit frightened. They had never seen anything like this before. They knew that they needed to investigate further to understand what had happened to Valkyrie.