Turtlebot

Turtlebot (also known as Evil Turtlebot) is a robotic entity that resembles the Teenage Mutant Ninja Turtles. It appears in both the 2003 video game and cartoon it was based on. The Turtlebot's appearance, origin, and method of fighting is different in both forms of medium, but is the creation of Baxter Stockman in both.

Video Games
Turtlebot is created by Stockman to frame the Turtles in robberies. The Turtlebot is capable of flight, fire lasers, and use energy versions of the Turtles' sai, katana, bo, and nunchaku. It is fought three times, each time gaining an upgrade addendum to its name (such as 1.5). The final battle against it is atop a cargo shelf carried by a helicopter. The Turtlebot is an unlockable character in the game's versus mode.

The Turtlebot also has a small cameo in TMNT: Mutant Melee. One of the bonus stages has your chosen character beating on mass-produced Turtlebots that have yet to be activated. In the mission briefing, they are erroneously referred to as "Mecha-Turtles"

Playmates released two figures based on this version of the Turtlebot: a standard one that looked identical to the video game version, and a darker repaint that was available in a S.W.A.T. playset.

Two unlockable designs in the game show a familiar looking "Turtle-mode" design. And an interesting "Ladybug-mode" showing a flying features similar to the Robot's final design. This particular mode is somewhat similar to the original Mechaturtle boss from the 1989 game. Perhaps after defeating the robot in Turtle-mode, it's "skin" would be shed to reveal the much more threatening and dangerous Ladybug robot.

2003 cartoon
A slightly different Turtlebot makes its appearance in the second season episode, "What a Croc!". Baxter tricks Leatherhead into thinking he is a friend of the Utroms and that the TMNT are their enemies, and unveils the Turtlebot as a trump card to defeat the Turtles. It is programmed with the data of each Turtles' fighting styles, so they simply switch weapons to defeat it. Baxter then is exposed to Leatherhead as an accomplice of Shredder, whom Leatherhead knows is the Utroms' greatest foe.

An unproductive story from the belated and related TMNT Animated Comic revealed the Turtlebot's name as "T-4". This version would have been able to disguise himself as any of the four Turtle brothers.

The unproduced comic's description read as follows. :

" Due to a one in a million freak accident, Baxter Stockman's computer becomes sentient... and seeks revenge for Turtles having destroyed so many of it's ("children" i.e., Mousers). So it creates the perfect killing ,machine to track down and eliminate the Turtles once and for all: T4, The Turtlenator. "