She's just there to yell science every single time there's a ridiculous bs solution to the contrived disaster of the week, that and to flip back and forth like everyone else.
I hate this contrived Barbie/Julia bs that they cranked up this season. He barely gaf about going through a portal and ending up in his home town.
They already are, it's just so poorly written, the rip offs can easily be forgotten about. So the main 'hero' protagonist has to go back to the others except when the other show did it, it was a major game changing plot twist that actually did have an effect on the other series and when UTD does it, it's just more bs for the episode.
Yeah, Melanie is obviously a replacement regardless of the writers trying to say otherwise. It is a little creepy for Jr to possibly being set up with someone that could've been with his uncle if they ever go there.