In the past: Michelangelo's journey toward vengeance takes a detour when he's captured, imprisoned, and forced to take part in a gladiatorial competition with fighters from all over the world. Though new friendships are formed with would-be foes, one thing is certain: the only way to attain his freedom is to fight. It will take all Michelangelo's skill to defeat those who stand between him and vengeance. Meanwhile, in the present (a.k.a. our future!): Casey Marie Jones and her young Turtle pupils grapple with the lessons left by their late sensei Michelangelo as the situation in NYC worsens.