Usually that just means it's hunting season again.

Look everyone!  Doc is back!  Hurrah!  (I guess they didn't need to organize that search party after all.  Good thing too because it was getting dark, and they were all pretty tired after rescuing Rusty and the little spotted dog, and it was starting to look like it might rain.)  With the reappearance of Doc, so too comes the next storyline.  It looks like Mark is going to be fighting illegal dumping in Lost Forest, or the surrounding area, as well as the threat of lead contamination.  This comic may also indicate the rising of another group out to get the Trails (or some sort of superpowers from the contamination) as the one behind the dumping seems not to be the shadowy figure behind the truck, but the short little bush that's in danger of being run over.  Yes folks, it looks like we could be dealing with mutant plant life.  I guess that's why Doc left that skunk to keep an eye on things.  (After all, everyone knows that the natural enemy of the mutant plant is not the trampling deer, but the stinky skunk.)  I shall wait with bated breath to see what fiendish industrialist is behind all of this (and hope that he bears some resemblance to Monty Burns).