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Season three of Detentionaire is confirmed to air in September 2013's Can't Miss Thursdays. I tweeted @TELETOON and they replied to me on April 29...
Q: @TELETOON When will Detentionaire (season 3) & Total Drama All-Stars air on #CantMissThursdays?
A:@EpicJDrolet Detentionaire S3 will premiere in September in #CantMissThursdays and Total Drama All-Stars is scheduled for November 2013!