This is my Master's Dissertation in full. The purpose of my study was to build upon the most recent work in digital marketing research. More specifically, I tested the digital marketing tactics of building online brand communities and user engagement on how they actually influence purchase. In order to do this I chose the company Rooster Teeth as a case study. I chose Rooster Teeth as they are one of the highest subscribed YouTube channels and have a history of digital marketing excellence. I completed a massive cross-sectional research analysis with over 1,500 participants, used SPSS to analyze the quantitative data, and offered new insights to digital marketing researchers as well as an actionable plan to the case study organization.