Billy Plimpton took to the stage and captivated the crowd at the triumphant ending to The Boy Who Made Everyone Laugh, and in the sequel, he's going to go viral. Celebrity comedian Leo Leggett takes Billy under his wing, as his new sidekick: when Leo tweets a clip of his stand-up act, Billy suddenly becomes the most famous boy in the country. At first, this is great -- all the kids at school think he's cool and he gets to appear on his favourite morning TV show. But Leo's motives turn out to be shady and Billy must turn the tables in a very public way ...