Kaboom! begins with Ninten walking on screen with a roll of tape and a screwdriver. He notices the camera then states he forgot he had a show because he was too busy fixing the parallel universe. A moment later he glances up at a calendar and realizes an entire month has passed (in our time—Ninten didn't release any videos in June). Ninten freaks out because he said it felt like just a few hours. Then after some thought he realizes that the only thing he had really been doing was eating cookies (at the end of the last episode, a stranger offered Ninten some cookies then told him to get into his van). Realizing that a month had passed, Ninten concludes that the universe wasn't parallel at all and he shouldn't worry about it. He then goes on to talk about the fourth of July and fireworks, and how his state is "cool" because they allow them. He tells YouTubers to enjoy a safe and happy fourth and to film themselves firing off fireworks dedicated to himself (then to submit them as video responses). He also explains that he'll be blowing stuff up as well, but with his mind. As the episode ends, he decides to show the audience, but ends up blowing up his house.