Walden meets Rose at Pavlov's bar, where she reveals to the audience that she had been spying on him. The two get along, and when Walden tells Alan, he tells him that she is trouble. However they begin to dating and Walden says that with Rose he is having the best sex he has ever had. However things get out of hand with her when she moves all her belongings into the house. When he reveals to her that Zoey wants to get back together with him she becomes angry and gets her ferrets to attack him, even leaving them in his car to attack him (although the ferrets end up attacking Alan instead). She goes to Zoey's and reveals that Walden got her pregnant, but this was just a lie. She is last seen stalking Walden through his window. When Walden's girlfriend after Rose, becomes a fashion model, Rose is revealed to be her agent who has sent her away to Japan to get her away from Walden so she can have him for herself. When Alan and Lyndsey are having an affair with each other one year after these events, her boyfriend hires an investigator to see who she is having an affair with. The investigator is Rose, who informs Walden that someone is trying to kill him, and so she takes him to a motel to hide with her. They apologize to each other for all the upset they may have caused each other and kiss and have sex. Kate met Walden at Target, where he introduced himself as Sam Wilson, dressed in Alan's clothes and looking in the store as he was pretending to be poor to find someone who didn't just want him because of his money. "Sam" and Kate hit it off and begin to date. When she sees where Walden lives, he pretends Alan is his rich landlord, she takes a dislike to Alan and so asks "Sam" to move in with her. She asks him to find a job, so he goes out selling Christmas trees. For Christmas he gets her a sewing machine, even though Sam Wilson could never afford it, but Walden Schmidt could, she thanks him and says that there should be no lies. She cares for Sam in a great way and tries to be romantic, hanging a piece of broccoli as she didn't have any mistletoe. Walden donated $100,000 to Kate to start up a fashion design business but made her think Alan did it, though Alan tried to pull the stunt of only donating half of it and keeping the other half for himself.