Spencer's deal with Megatrain

This is the scene for when Megatrain and Spencer make their deal in Thomas' Place as a Prime.

Spencer: The sooner I find Tirek, the better.

????: PSST! Hey you!

Spencer:

???: Come over here, to the rock.

Spencer: Are you a rock?

???: No, I'm deep underground in a prison. I don't know how I will be able to get out of here, but I think I can work something out with you.