his spiritual journey, but she eventually accepts it. During "The Fifth Man," she rushes from a conference in Portland, Oregon, to be by Don's bedside when he is stabbed. Don proposes to her in season 6. She rejects his proposal, stating that he is still in the middle of changes in his life. She promises to accept his proposal when he finds what he wants from life and becomes his fiancée by the end of the season. Actor Rob Morrow asked the producers to explore Don Eppes's personal life, which included his romantic relationships. Writers planned for Don to have a relationship with someone who was not a regular cast member. Michelle Nolden, who had previously starred in Showtime's Street Time as the wife of Morrow's character, was cast as Brooks. Writers and producers planned to bring back Nolden's Brooks for season three. The 2007-2008 Writers’ Guild Association's strike postponed the return of Nolden's character within the storyline. Heuton and Falacci intended to have Robin and Don's relationship continue through season five. Otto Bahnoff Otto Bahnoff (portrayed by John Cariani), who prefers to be called "Ottobahn" like Autobahn, is a brilliant but nervous and excitable CalSci engineer who appears in the season six episodes "Dreamland," "Arm in Arms," and "Cause and Effect." Otto specializes in plasma physics and technology. He serves as a foil for Charlie with his apparent genius, ability to get completely lost in his work, and early uneasiness with criminal violence. As Larry takes over Charlie's FBI responsibilities for his leave to Cambridge, the enthusiastic Otto serves as assistant to Dr. Fleinhardt. He triumphed physicists replacing the mathematicians. Russell Lazlo Professor Russell Lazlo (portrayed by Tony Hale) is an eccentric CalSci geneticist who appears in the season six episodes "Hydra" and "Devil Girl." Charlie says he is like a "savant of genetics." He delights in helping Charlie despite his lack of mathematical knowledge and is happy to meet Amita, wondering if she had any sisters. Charlie and his group seem somewhat annoyed by him. Russell is in a riding club and helps Don with repairing his motorcycle and providing camaraderie. Roger Bloom Roger Bloom (portrayed by Henry Winkler) is an FBI agent who first appeared in the episode "Jack of all Trades." He reappears in the episode "Greatest Hits," where we are informed that he was forced to leave the agency due to the events in "Jack