The Vampire Hornets were once normal Hornets of Zurg, before NOS-4-A2, turns them into his vampire-robotic minions. They are minor villains in the television series, "Buzz Lightyear of Star Command", and minor players in the third part of Disney vs. Non-Disney Villains War.
Disney Vs Non Disney Villains War - Part Three
Somehow, NOS-4-A2 turns some of Zurg's Hornets, into his vampire minions. When the time has come for the energy vampire, he turns traitor to his original master, Zurg. He thus orders his arrest by his robotic minions. Though they failed to seize Zurg, Skeletor and the Mutant Army, secret allies of NOS-4-A2, manage to weaken Zurg's empire and force Zurg and the rest of his army to retreat from Planet Z.