You used to be a Predacon under Megatron’s command but one day Optimus Prime saved you from Megatron’s cruel environment and made you an Autobot. Eventually Optimus adopted you and now you’re his child.

You were kidnapped by Decepticons because Megatron wanted you back. Prime and the other Autobots came barging into the room where Megatron kept you. Luckily there were no Decepticons around so Optimus easily removed you from your chains.