This crazy colored G1 Megatron was a proposed reissue that was ultimately scrapped because he was still too much of a gun.
![Image](http://www.seibertron.com/images/toys/uploads/1371504891_4.jpg)
![Image](http://www.seibertron.com/images/toys/uploads/1371504891_5.jpg)
Here'a couple of early prototypes for the G1 City-formers Metroplex and Trypticon.
![Image](http://www.seibertron.com/images/toys/uploads/1371506726_1.jpg)
![Image](http://www.seibertron.com/images/toys/uploads/1371506726_2.jpg)
This early concept for the G1 Predacons featured Razorclaw with a head that transformed into the head for Predaking.
![Image](http://www.seibertron.com/images/toys/uploads/1371506726_3.jpg)
![Image](http://www.seibertron.com/images/toys/uploads/1371506726_4.jpg)
Here we have a look at the G1 Unicron prototype, this version came with an orbiting moon accessory and featured a voice changing feature.
![Image](http://www.seibertron.com/images/toys/uploads/1371504891_6.jpg)
![Image](http://www.seibertron.com/images/toys/uploads/1371504891_7.jpg)
This Cyclonus prototype was originally used as a model by the animators of the 1986's Transformers: The Movie.
![Image](http://www.seibertron.com/images/toys/uploads/1371504891_8.jpg)
Lastly we have some images of the unreleased G2 Protectobots.
![Image](http://www.seibertron.com/images/toys/uploads/1371504891_9.jpg)
![Image](http://www.seibertron.com/images/toys/uploads/1371504892_10.jpg)
![Image](http://www.seibertron.com/images/toys/uploads/1371504892_11.jpg)
![Image](http://www.seibertron.com/images/toys/uploads/1371504892_12.jpg)