I noted back when Ultra Car and Monkey Master had their first showdown back in Hundred Dollar Theatre that I was clearly setting up a Round One for some triumphant Round Two to occur later.  Monkey Master and Ultra Car were designed to be arch-nemeses back when I was a kid, before Monkey Master got subsumed into being Head Alien’s lackey and Ultra Car got subsumed into being, well, a toy store stock worker.

And so Round Two gets thrown right out the window, so to speak, as she neglects to fulfill her narrative duty.  This is honestly more in character.