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Australia's sharpest business brains are back with sharper teeth. With the Sharks putting their own money in the stakes are high. Lives will pivot as Entrepreneurs fight for their ideas.

WA inventors seek $1 million to launch their world's first electric hydrofoil; a construction manager wows with a fashion product; doctors pitch their solution for children with allergies.

A small business owner with an unexciting product has the Sharks in a frenzy when she reveals sales numbers; Nick Bell locks horns with an entrepreneur seeking a lot of money for little equity.

Will & Woody go undercover pitching an edible serviette. A camera that takes 27 photos, a basic band to hold clothes into place, and a cabin bag that converts into a stroller.

The Bachelor, Matt Agnew, pitches a non-alcoholic beer. An entrepreneur offends the Sharks by asking them to pay him for his time. And a device could help millions of women with a painful problem.

Two Inventors have some fast talking to do when their new improved toilet brush snaps. Robert Herjavec gets schooled in the art of hair extensions. A hot food product sends the Sharks into a frenzy.

A former model freezes during her pitch for an in-flight sleeping bag; inventors demonstrate an industrial saw that absorbs dangerous dust; social media influencers pitch their feminine outdoor swag.

Dr JJ's pitch starts with "Smell my armpit," and ends with the Sharks making an offer; a mum presents her solution for easily untangling kids' hair; a doctor puts forth his invention for men's health.