Alex Mercer is a prominent figure within the Paranormal Military Squad, serving as a leader who is instrumental in guiding the team, particularly in the realm of interspecies communication. His role involves spearheading the squad's efforts to engage with extraterrestrial intelligence, leveraging his military background to enhance the mission's success. Mercer's leadership and expertise are vital to the Paranormal Military Squad as they navigate the complexities of communicating with beings from other worlds.