Basically, Bessie and Portia adopt part of a highway, only for massive amounts of weeds to start growing to monstrous proportions, eventually morphing into a ginormous vine monster that ensnares them both.
It's really brief as Happy shows up to kick ass and take names about three seconds later, we don't even get any mmphing from Bessie or Portia, but it's pretty cute and it also gives all three main Mighty B girls (Bessie, Portia, and Gwen) at least one full-treatment DiD scene at some point in this series, which is nice.
Oh, the full episode is available here on Nick.com, at least for right now:
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