Assassination Classroom
The students of Class 3-E have a mission: kill their teacher before graduation. He has already destroyed the moon, and has promised to destroy the Earth if he can not be killed within a year. But how can this class of misfits kill a tentacled monster, capable of reaching Mach 20 speed, who may be the best teacher any of them have ever had?

Season 2 · Episode 22 ·
Happy Birthday Time
The students fight to see their teacher one last time. A figure from Koro Sensei's past arrives with a serious grudge against the super-creature.
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Episode 22 of season 2 of Assassination Classroom: “Happy Birthday Time”. Aired 2016-06-10. Watch it online free on ZapFlix.