Board Thread:General Discussion/@comment-1255374-20150216052443/@comment-1255374-20150302054022

DPfanboy wrote: The only thing stockman would be missing for the retromutagen is April's DNA.

And I'm referring to the prototype retromutagen that Stockman spilled in the serpent DNA. So that's why Karai is a human with snake eyes. Donatello should have a perfected retromutagen for Karai. Otherwise, Warthog Zeck and Rhino Steranko will attempt to steal some just like Stockman Fly in The Lonely Mutation of Baxter Stockman.