As HA says, he transmogrified Anti-Head Alien’s body and outfit to match his latest pre-death look.  It’s mostly because I’d grown to dislike the older, shoulderpadded Head Alien design, and didn’t want to have to be stuck with it for the finale.  But also because it shows off Heady’s new godlike powers.  He’s always been a theatrical bongo, but now he’s a whole theater troupe.

We also see Monkey Master continuing to make decisions re: allegiances.   Here he disobeys a direct order and sets Sal down gently.