A former athlete believes his product can save lives; environmental lawn-mowers; solution to car sickness; kids birthday party franchise.

Things get heated when the sharks deal with a husband-and-wife team.

The Sharks are stunned by the exploits of two sisters with a children's dance company; a chef with tasty seafood products and more

A shark wants to invest $4 million in a business; a toy-rental business; a bacon-scented wake-up call; an update on a deal from last season.

A capsule that keeps beverages hot for an extended period; a new way to clean stuffed toys; reinventing the ice cream experience.

Frozen concentrated gumbo brick; a bird feeder that shocks squirrels; artisan coffee subscription business; wooden home and kitchen items; ECreamery update.

First into the Tank are entrepreneurs from Arcadia and Folsom, California, who have a solution to fight back against bothersome telemarketers and scammers. Entrepreneurs from Oakland, California, present their easy-to-use 3D printer for kids to design and print their own toys, while an entrepreneur from New York, New York, pitches her savings and gifting online platform to help kids learn to save. Last into the Tank is an entrepreneur from Labelle, Missouri, who familiarizes the Sharks with her ethical and customizable meat box subscription delivery service.

A beauty product that combines luxury and glamour with safety and quality; a product for cutting cheese; a space-saving beauty organizer; a way to remove pet hair from clothes; an update on FitFighter.

An entrepreneur from San Francisco, California, tries to show the Sharks the upside of investing in her women’s undergarment subscription service. A chef from Falls Church, Virginia, brings out his effortless approach to a classic breakfast meal. An entrepreneur from New York City shows the Sharks her eco-friendly alternative to collecting dog waste. A scientist and former competitive body builder from West Orange, New Jersey, pitches his healthy take on a beloved snack food.

Jax Sheets; reusable, eco-friendly, more comfortable bed sheets that will last you and your spouse year-round (NO), The Pizza Cupcake; pizza flavored bagels shaped like cupcakes (YES), IceBeanie; cooler technology in a beanie to relieve chronic stress headaches, especially after high energy sports games (YES), Draft Top; can opener to remove can tops from draft beer, as well as any other canned beverages (YES)

The Tank is transformed into a winter wonderland, and entrepreneurs present Sharks with business opportunities that celebrate the magic of the holiday season.

An 11-year-old inventor from San Clemente, California, recycles a skateboard deck to fit inside lockers and backpacks; an entrepreneur from Meridianville, Alabama, revolutionizes aerial sports; a husband and wife team from Vicksburg, Mississippi create outdoor camping gear; and an entrepreneur from San Francisco, California, claims her five-minute meditation app will help the world reduce stress.

Children seek a backer for an idea spawned during a family trip and the sharks fight for a piece of a mother's furniture business.

Tensions rise when Mark Cuban urges entrepreneurs to ignore the other sharks and negotiate only with him.

An Illinois perfume peddler; a San Francisco woman selling luxury soap; an Alabama guitar teacher who says his learning system is unique; a “Mr. Mom” from Baton Rouge, La., with accessories for blue jeans. Also: an update on a gourmet seafood business from Season 2.

The sharks attempt to make the big deal.

Professional dancers Jonathan Roberts and Anna Trebunskaya demonstrate their posture correction device; entertainment reporter Robin Leach and a designer from Florida present stone-studded leather jewelry; a gluten-free cookie business.

A motorized vehicle suit; comedy writer Bruce Vilanch presents a computer instruction project; sugar-free candy chips; an update on a foldable guitar.

A successful entrepreneur returns with a new business idea; hand-held cooler; environmentally friendly dry cleaning bag; chewing tobacco alternative.

A fishing bobber made from a shotgun shell; homemade cupcakes in a jar; generating electricity through walking; a belt with no holes; a fitness-based dance program.

Teaching kids how to ride a bike that doesn't have pedals; a movie about motorcycle racing; a hot-pink food truck run by beautiful women; fun photo booths.

A family of entrepreneurs from South Carolina, and Alabama, present a product that satisfies a unique obsession; a husband and wife from New Jersey introduce their subscription service that makes meal time for kids stress-free for parents; an entrepreneur from California pitches his Bollywood-inspired dance fitness program; and a husband and wife from Texas give the Sharks a taste of their probiotic beverage.

First into the tank are brothers from Provo, Utah, who introduce their fun and adventurous treasure hunt game experience for cities across the country; entrepreneurs from Cedarburg, Wisconsin, and New York City present their line of affordable and ethical streetwear that donates a school uniform to a child for every purchase; cousins from Dallas, Texas, present their eco-friendly product that helps wipe away your bum; entrepreneurs from San Jose, California, pitch their hands-free pet tool that makes bath time easier.

First into the Tank is an entrepreneur from Willis, Texas, who introduces her lay-flat cosmetic bag design that allows for easy access to materials. Entrepreneurs from San Diego, California, pitch their online boutique subscription shave club exclusively intended for women; while entrepreneurs from Basalt, Colorado, and Newport Coast, California, present their functional cat furniture designs which are durable and easy to clean. Last into the Tank is a mom from Palo Alto, California, who provides comfortable and stylish play dresses for mothers with young children.

Entrepreneurs from Austin, Texas, and Cour d’Alene, Idaho, who pitch their safety product that helps people travel with their pets; an entrepreneur from Venice Beach introduces his curated wines with straight-forward labels for a snob-free client; an entrepreneur from North Hollywood, Cal., presents his twist on an urban-centric hair product to help amplify natural curls; and an entrepreneur from Oakland provides a subscription service that delivers Montessori Method-approved toys to families.