Three days passed after Spike's Dragon Quest. The little dragon was disapointed about what he learnt from those teenagers dragons, were they all jerks? Were they all cruels?
Looks like it's his lucky day: a teen dragon named "King" came to Ponyville to live there, because he couldn't take it anymore to live "with those stupid and jerks dragons".
Spike sees an opportunity to learn more about his race and asks the newcomer to teach and train him. And this is where begins King's Training for Spike, a Dragon Training.

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