A Dallas, Texas, real-estate broker's pitch leads to a battle of billionaires about his business model for a way to make house hunting more convenient; a 10-year-old kidpreneur from Broomfield, Colorado, created a lemonade-stand business to help other kids start their own businesses; a mother from Allen, Texas, designs Made-in-America multi-functional covers for infant car seats; and a tenacious man from Austin, Texas, pitches the Sharks his Korean BBQ fusion restaurant food-truck business. Also, a follow-up on Rent Like a Champion, a weekend rental-home business, which Mark Cuban and Chris Sacca invested in during season 7.