Overview: On this season finale--the dragons battle it out over some of the best ideas ever brought to the den: including, a new marketing tool to keep you glued to the screen; a mask that keeps the germs away; and homebuilding with a twist. Plus, the one-stop-shop for ethical products. Pitches include: Ethical Ocean, Mascare, The Skrapr, SuperSales Tag, Karoleena Custom Homes, Powerdent.