offers, one from the FBI to develop his equation as an investigative tool and one as a statistician with the minor league team. He accepts the latter job offer. Fans enjoyed Oswald's appearance on the show and continued requesting Oswald's return. Falacci and Heuton, along with the cast and crew, were amazed by Baruchel's performance, and Falacci and Heuton decided that Oswald was to be a recurring character. The writers wrote another episode featuring Oswald. In "Democracy," Charlie encounters Oswald and resumes to persuade Oswald to enroll at CalSci. Upon Dr. Millie Finch's (Kathy Najimy) suggestion, Charlie asks Oswald to help him investigate a series of numbers which Charlie's friend, a demographer named Rachel Lawson, left him before her murder. He and Charlie learn that Lawson and her fellow demographers and statisticians unwittingly constructed an algorithm which manipulated election results in precincts with very close elections. Charlie and Oswald's clues lead to a congressional investigation into the election and Lawson's work being published. Oswald then tells Charlie, Alan, and Don that he has decided to enroll at CalSci. Heuton and Falacci planned to bring Baruchel back for season four, contingent on Baruchel's filming schedule. Dr. Marshall Penfield Dr. Marshall Penfield (portrayed by Colin Hanks) is a recurring character on the American television show Numb3rs. He appears in two episodes, "Convergence" and "Frenemies." The archrival of Dr. Charlie Eppes (David Krumholtz), he is a fellow Princeton mathematics prodigy and has constantly argued with Charlie over everything, including Amita Ramanujan (Navi Rawat). Both were intimidated by one another. Penfield would bother Charlie by calling him "Eppsy," but he now prefers the nom de guerre Chuck after an understanding. He developed the theory of deep current sets and challenged the Eppes convergence. Marshall Penfield is a favorite recurring character of the cast and crew. Robin Brooks Assistant United States Attorney Robin Brooks (portrayed by Michelle Nolden) is a recurring character on the American television show Numb3rs. The current girlfriend of FBI Special Agent Don Eppes (Rob Morrow), she has made several appearances since her first appearance in "The O.G." Due to her commitment issues, she and Don temporarily broke up during season 3 and part of season 4, restarting their relationship during the end of season 4. At the beginning of season five, she attempts to talk Dr. Charlie Eppes (David Krumholtz) into regaining his security clearance. Later, she and Don clash over