Ever since the Ninja Turtles have left New York City, The Kraang have been guarding the Turtles' Lair. So they created these robotic orbs that are programmed for security purposes. These are known as Kraang Security Orb.
Serpent Hunt: Multiple security orbs were seen patrolling the city for anybody left.
Battle for New York: Multiple security orbs were patrolling the city and helped the kraang fight the turtles but were defeated and with the rest the kraang and were banished to Dimension x with the rest of the Kraang . .
- While guarding, these orbs seem fairly similar to Baxter Stockman's Balls of Doom.