"JT Machinima's song Doomguy Vs Master Chief Rap Battle" is a rap battle between two iconic video game characters, Doomguy and Master Chief. The song showcases the rivalry and competitive banter between the two characters. In the lyrics, Doomguy, who is the protagonist of the Doom series, boasts about his achievements of defeating the armies of Hell multiple times and his massive weapon clip capacity that doesn't require reloading. He taunts Master Chief for being the "new guy" and accuses him of ripping him off. Doomguy also criticizes Master Chief's appearance and weight, challenging him to face him without his super soldier enhancements. Master Chief, the protagonist of the Halo series, retaliates by highlighting his worldwide reputation as the UNSC's elite soldier. He emphasizes his skills as a weapon himself, regardless of the gun he carries, and mocks Doomguy's habit of ripping off enemies' chins. Master Chief also suggests that Doomguy should be aware of bloodborne pathogen risks. The third verse continues the insults between the characters, with Doomguy challenging Master Chief's ability to keep up with him and suggesting Halo's story could put him to sleep. He ridicules Master Chief's dedication to his job and compares himself to a vampire. In response, Master Chief confidently proclaims himself as the ultimate pro in wrecking enemies and suggests calling him "Daddy." He dismisses the devil's influence and boasts about saving the world, getting the girl, and having nothing to prove. The chorus throughout the song emphasizes the cliché nature of saving the world, portraying both characters as iconic heroes. Despite their rivalry, they share the common goal of stopping evil plots, while also highlighting their love for blowing things up. Overall, the song portrays the competitive and humorous interaction between Doomguy and Master Chief, showcasing their contrasting characteristics and strengths while playfully dissing each other.