Calvin O'Keefe is a fictional character from the novel "A Wrinkle in Time" by Madeleine L'Engle. He is a high school student who is intelligent, athletic, and somewhat of an outsider. Calvin has a special ability to connect with others, which helps him throughout the story as he embarks on a journey through space and time. In the narrative, Calvin joins Meg Murry and her brother Charles Wallace on a quest to rescue their father from an evil force known as IT. His character represents bravery and loyalty, showcasing the importance of friendship and teamwork in overcoming challenges.