"Vlad's Past" is the fourth episode from the animated series, Shuriken School. It was aired on September 10, 2006.
Eizan, Jimmy and Okuni see a secretive Ninja tell Vlad that he's failed Evasion Techniques for Experienced Ninjas -- the final exam for the correspondence course he's been following. When he was still a student, Vlad didn't have time to finish his exams and he doesn't have the require detaching diploma. To his despair, all he can do is resign from the School, but Eizan and his friends come up with a plan to prevent their favorite teacher from quitting.
Shuriken School Students