Season 1
| Episode 13 -
Notes from the Underground (1)
When Don's examination of some mysterious crystals attracts the attention of a subterranean monster, the Turtles underground exploration unearths a Foot Genetics Lab! A video record of strange experiments reveals more of Shredder's mysterious agenda, but when the mutants attack, the boys better watch out, or it's everybody out of the gene pool!
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