Transformers: Armada Gigacon Megatron with Mobile Artillery Truck.
A heavily armed tank that transforms into a heavily armed robot, the Megatron is a lean, green war machine in either mode. Ten inches long, the tank features a spring-loaded main gun--just push the barrel for flashing lights and firing noises. Fearsome jaws project from the front, the gun turret swivels, and there's a rotating missile launcher too. Now unfold those rear tracks, flip the turret, do some more twisting and unclipping according to the instructions, and the tank turns into the Megatron robot, bristling with firepower. There's a baby Leader-1 Mini-Con figure too, which acts as a rocket launcher, a mini-robot, and the key with which most of the tank and Megatron's features can be accessed. The little sidekick even becomes a handgun on steroids, when attached to Megatron's arm.