While experimenting with a heat pump that used water instead of Freon, Johnson connected a nozzle to his bathroom faucet and was struck by the power of the water stream. This serendipitous moment sparked the idea for a high-powered water gun.

Johnson created a rudimentary prototype of the water gun using PVC pipes, Plexiglas, and a soda bottle. He tested the prototype in his backyard and refined the design based on his observations and feedback. This early version, initially called the 'Power Drencher', proved the concept's potential.

After struggling to find a company willing to license his invention, Johnson eventually partnered with Larami Corporation (later acquired by Hasbro). The 'Power Drencher' was rebranded as the 'Super Soaker' and launched commercially in 1989. It quickly became a massive hit, selling millions of units and revolutionizing the toy industry.

The Super Soaker became a global phenomenon, with variations and improvements being introduced over time. The product line expanded to include different sizes, power levels, and designs, catering to a wide range of consumers. It remained one of the best-selling toys of the decade.

Johnson won a settlement of almost $73 million after suing Hasbro for underpayment of royalties on the Super Soaker and other toys. This lengthy legal battle highlighted the challenges inventors often face in protecting their intellectual property and receiving fair compensation.