You will Watch TMNT Season 1 Episode 13 online for free episodes with HQ / high quality. Stream cartoons TMNT 113 Notes from the Underground, Part 1 While Donatello examines a pair of mysterious crystals, the lair’s perimeter alarm is triggered after the crystals begin to glow. The Turtles investigate and find tracks indicating the presence of some unknown creature. These tracks lead them deep underground where they uncover an abandoned Foot Genetics lab. First appearance of Quarry, Stonebitter and Razorfist.