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In the two part episode "Invasio" (Last episode of Season 2), The Shredder and Splinter duke it out, with Shredder blitzing Splinter in the time of a lightning bolt strikes. I calced it to be Hypersonic. This would upgrade pretty much everyone to Hypersonic from Supersonic+.
https://vsbattles.fandom.com/wiki/User_blog:Darkanine/TMNT_2012:_Shredder_vs_Splinter
https://vsbattles.fandom.com/wiki/User_blog:Darkanine/TMNT_2012:_Shredder_vs_Splinter