A thoughtful and intelligent Christian fundamentalist preacher who challenges Ellie's empirical worldview. He represents a nuanced perspective on faith and plays a significant role in exploring the novel's themes of faith and reason.

A highly ambitious and competitive radio astronomer who views science as a field for personal advancement. Initially critical of Ellie's work, he becomes instrumental in the efforts to decode the extraterrestrial Message.

An unassuming astronomer with a deep commitment to scientific inquiry and a supportive mentor and ally to Ellie. He values human connection and provides encouragement and balance to Ellie's ambitions.

A celebrated Soviet physicist who fosters international collaboration and is a key ally to Ellie. He emphasizes the importance of transcending nationalistic rivalries and is essential in the quest to decode the Message.

An eccentric and reclusive billionaire who provides critical assistance with his vast resources. He is both a visionary and a manipulative figure, driven by both altruistic and self-serving motivations.

The president’s science adviser and a key ally to Ellie, who navigates the political complexities of the extraterrestrial discovery. His relationship with Ellie creates tensions between scientific ideals and political realities.

A high-ranking Department of Defense official who views the extraterrestrial Message with suspicion and prioritizes national security. He represents bureaucratic and nationalistic perspectives that challenge the open sharing of the discovery.