Professor Sullivan is a marine scientist and a friend of Rupert’s whom Jan convinces to help him stow away aboard an Overlord ship. Professor Sullivan, like Jan, is one of the few remaining true scientists, studying Earth’s last frontier in the deepest parts of Earth’s oceans. Sullivan is cognizant of the fact that, although he has made many contributions to science, none of them are grand enough to cement his legacy in the history books. Sharing Jan’s boldness and desire to discover the unknown, as well as seeing an opportunity to do something that he will be remembered for, Sullivan quickly agrees to help Jan carry out his scheme. Sullivan is in the midst of building a replica whale for the Overlords to ship back to their home planet, and he adds a small room hidden in the whale’s body cavity for Jan to conceal himself in. With Jan inside, Sullivan delivers the whale to the Overlords, who load it in one of their supply ships and send it back to their planet, carrying Jan into space and beyond Earth’s solar system. As Sullivan sees Jan off, he realizes that he has grown fond of the young man, and hopes that he is not sending him to his death.