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@Phineas&Milo n Gravity Falls "Total Drama" had 7 seasons when it aired on Cartoon Network in the USA. "Pahkitew Island" was season 6 and "The Ridonculous Race" was season 7. If I remember correctly, this happened on Cartoon Network OnDemand when "The Ridonculous Race" aired in 2015. For example, episode 5 of TDRR was listed as S7E05.
If "Total Drama" was owned by Walt Disney (in the USA), then it would've had 7 seasons over 7 years (June 2008-October 2015).