Tik and Tok have found their gems so it's just Tom and Pleasant again.
Tok still has stuff for sale which you'll need.
In the next area, Sensei is back to explain multi-attacks. Mel is there too and she joins you.
You find JB's dog tag so he must be close.
There are lots of battles and wading through dirty water ahead.
Behind one of the waterfalls you'll find the Purple Belts.
The Brown Belts are also down here, and in the same room, Randomaxes which make quick work of the boss's pets.
Bumper will let you go as soon as you defeat her and her children.
From here, there's only one thing left to do! Get JB back!