Dragonborn: The False Heir

Quick answer: 9 episodes, English original audio, and episodes 1–9 play right here tonight.

On the continent of Azeroth, the Targaryen family rules over the dragons. In a past life, Rhaenys—the Dragon Queen and the sole heir to the imperial bloodline—devoted herself to raising her son, Jon Snow (the imposter), helping him successfully claim the title of Dragonlord, only to be poisoned and assassinated by her sister, Selena. Consumed by rage, Rhaenys unleashed her dragon’s might, intent on slaying her sister—only to be stabbed through the body from behind by Jon Snow (the imposter). Selena stood over the dying Rhaenys and revealed a hidden secret: on the day Rhaenys fell into a coma after laying her egg, she had already swapped her own dragon egg with Rhaenys’s pure-blooded one. The child Rhaenys had nurtured with dragon’s blood for a hundred years was Selena’s son, while Rhaenys’s own flesh and blood had endured unspeakable torment. Jon Snow coldly extracted Rhaenys’s dragon core; amid their maniacal laughter, Rhaenys died in a fit of hatred.

The next moment, Rhaenys awoke with a start from her dragon bed. The dragon egg was still there; everything had returned to square one. Suppressing her hatred, she feigned unconsciousness and watched as Selena came to swap the dragon eggs, just as she had in her past life. Once Selena had left, Rhaenys rose and swapped the two dragon eggs back. Caressing her own pure-blooded dragon egg, she swore to repay the suffering she had endured in her past life a hundredfold.