Teenage Mutant Ninja Turtles Season 1 -

: Major arcs include the "Notes from the Underground" trilogy and "The Shredder Strikes Back".

: The season concludes with the Turtles infiltrating the TCRI building , discovering their origin's link to the Utrom aliens, and Splinter mysteriously disappearing. 2012 Animated Series (Nickelodeon) Teenage Mutant Ninja Turtles Season 1

: The season finale, "Showdown," features a massive battle against the Kraang and Shredder, revealing that Shredder's daughter, Karai, is actually Splinter's lost daughter . Recent Reboots : Major arcs include the "Notes from the