[After that battle against Starscream, Optimus Prime (and presumedly Bulkhead) have boarded the White Chalice. The following is a video broadcast made by a twenty foot tall red and blue robot currently standing in a disused corner of the hangar.]
Greetings, Humans of the White Chalice, I am Optimus Prime and I speak for the Autobot forces currently active on Earth. As some of you may know, I have in my possession an artifact known as the AllSpark. It's power, if misused could potentially destroy all life on this planet. I thought it was safely hidden, but...well, this clearly isn't the case anymore. Right now I think keeping it mobile is our best bet. To that end, I would like to keep the AllSpark on your ship. In return, my subordinant Bulkhead and I shall help you in any way we can. I would have preferred not to get humans involved in this battle, you seem to have enough trouble as it is, but at this point I think it's too late for that.
I hope we can all get along. All I request is a safe place for the AllSpark and somewhere for us to live. I realize that last one might be a problem, considering how much larger we are, but I'm sure something can be arranged.EDIT:
Also I found this Key
stuck into my chest after the battle. I can't touch it without feeling all weird and tingly, so maybe a human should hold on to it for now.