The Thrill of the Hunt

Ratchet thinks back to the time when he served in the Cybertronian War as a field medic. During the fighting, he was sent to rescue an Intelligence agent named Arcee who was injured during the fighting. The intelligence codes she possesses could turn the war in the Decepticons' favor. For that reason, Megatron sends Lockdown to capture her, snagging Ratchet in the process. In order for the Decepticons not to receive the codes, Arcee tells Rachet to use his EMP generator to wipe out the codes. He reluctantly obeys and the aftermath is Acree losing her memory and Lockdown gaining Rachet's EMP generator. Back in the present, Lockdown has resurfaced and uses Ratchet's EMP generator to capture Optimus Prime. Recruited by Blitzwing and Lugnut to locate the Autobots who destroyed Megatron, Lockdown is revealed to be just a bounty hunter who doesn't care about the Decepticons' cause and just does it for the 'upgrades' he can get. Ratchet eventually defeats him, reclaims his EMP generator and saves Prime, and opens up about his experiences to his leader.