The A6 Annihilator
(given its name from the SNES Teenage Mutant Ninja Turtles IV: Turtles in Time
instruction manual) or Robot Walkers
(ロボットウォーカー, from the Japanese Return of the Shredder
manual as well as the credits for Turtles in Time) is a bun-shaped pod robot with tentacles and a laser turret.
In Turtles In Time they fire lasers at the Turtles, capturing them in a lasso-style. They are also dropped by Krang during his second boss fight.
A6 Annihilator in Teenage Mutant Ninja Turtles III: The Manhattan Project.