Marcus Pearson is a former friend/employee of MrBeast. An official reason as to why he was fired is unknown, but most believe it was due to drug related issues.
Following Pearson's termination, he took to his Instagram story to accuse MrBeast of creating the coronavirus, claim his termination was wholly based on race, and reference harm towards MrBeast. As Pearson had previously posted images of himself drinking and smoking unknown substances in the past, it is likely that he had made the accusations under the influence of drugs. He first appeared in challenge videos in 2019 but was fired in 2020.
Pearson didn't win a single Mr. Beast challenge.