As Optimus and Megatron join forces, they need humans forms to evade M.E.C.H. Their holoforms and holoshells had been developed by Ratchet, well... Optimus' form was, but Megatron had Sound wave develop his.

As Optimus looks over his holoform, it was a bit difficult to get used to the massive weight difference in his form, and he was a bit wobbly on these human legs, but Optimus was getting better. For a human form, he thought he looked pretty good. He thought he was convincing for a human.

"Primus, is this even worth it?"

Optimus heard a familiar voice, glancing behind him in the mirror. His eyes widened and he turned around, only to be grabbed and held onto.

"Megatron--" Optimus says, his hands gently coming up to stabilize Megatron. "Primus, you don't have any balance!" Optimus chuckles softly.