From the very first episode, Nickelodeon's Teenage Mutant Ninja Turtles -- which is about to begin its fifth season -- has proven to be more than just another take on the beloved cartoon from the 1980s. This iteration has come with unique story arcs, a radically different art style, and all-new versions of the characters. It's TMNT for a whole new generation, and yet has maintained the spirit of the old versions as well. Suffice to say, putting together a Top 10 Episodes list was a shell of a challenge, but somehow we managed to narrow it down -- like a Turtle do!

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HM Trans-Dimensional Turtles

10 Metalhead Rewired

9 Turtles in Time

8 The Good, The Bad, and Casey Jones

7 Target: April O'Neil

6 Annihilation: Earth!

It's worth noting that, while we did take our original review scores into consideration, they weren't the deciding factor in putting together the Top 10. Sometimes it takes a season or more to put certain episodes into perspective, as you'll see below.You can also check out our previous list of the Top 10 episodes of the original TMNT animated series , as we prep for the kick off of Season 5 of the current series this coming Sunday.So, without further ado, here are the 10 best episodes of Nickelodeon's Teenage Mutant Ninja Turtles...In "The Good, The Bad, and Casey Jones," we get our first real team-up between fellow hotheads Raphael and Casey Jones, who hit it off much to great effect. Highlights include the debut of Casey's vigilante outfit, a skirmish between Casey and Raph, and a baller subway chase that still holds up as one of the show's coolest set pieces.