If the millionaires like an idea, they're ready to invest hundreds of thousands of pounds of their own cash straight away to kick start the business.
But if they don't like it, expect fireworks as the millionaire investors make their feelings crystal clear and the budding entrepreneurs see their dreams of instant business success reduced to tatters.
Series 12 of Dragon's Den starts on Wednesday, 8 April at 20:00 on BBC Entertainment, channel 120 on DStv.