Kraken (2012 TV series)

The Kraken is a giant squid that the encounter on their journey to the pirate times in Turtles Take Time (and Space)

Trivia
The Kraken is a legendary sea beast. Although it was initially purported to be more like a giant whale or crab, the Kraken is most seen as a monstrous octopus or squid, and many believe it might have actually been an actual giant squid that inspired the legend.