The question of what Rung transforms into was recently solved in the latest issue of More Than Meets The Eye (the space series).

Kind of. He transformed but he doesn't know what he transforms into. Nobody does. It's just a thing.

And this evening it just clicked for me.

So I went and got an old comic out to check.

And then I was even more sure of my guess.













Last spoiler warning













Compare and contrast the lever that manually transforms Metroplex in the UK comics and Rung's alt mode.



Look at how Blaster and Swerve are grasping their items. Consider how James Roberts is a diehard UK comics fan.

And think about how important the Metrotitans are in the IDW universe.

What might happen if Rung is plugged into Metroplex?!?



Or he could just be an ornament.