Transformers: Animated

Now that Megatron's body is rebuilt and designed to blend in on Earth, Optimus Prime, Prowl, and Bulkhead battle valiantly against him only to get brutally beaten. Then after punching Starscream (with the key sticking out of Megatron's fist), Megatron uses Sari's key to lead Lugnut and Blitzwing to Dinobot Island, unaware that Blackarachnia has beaten them to it. The battle between Optimus and Megatron leads them back to the Autobot ship and Megatron gets his hands on the Allspark. Then, Optimus Prime uses Sari's key to tackle Megatron, destroys the Allspark, and cause Megatron some serious damage. In the end, it is revealed that Megatron has kidnapped Issac Sumdac for some evil plan.