05E24 - Doppelgangers

A couple of weeks after they make the vow to start a family if they see Barney's doppelgänger - the last of the five whose doppelgänger has not been seen - Lily and Marshall see that person in the form of a cabbie. They even telephone Barney to see if it isn't him in yet another scam to meet and sleep with women. They however decide not to tell anyone of their decision. When Marshall learns that the cabbie they saw really was Barney and not his doppelgänger, Marshall has by that time gotten into his mind that he really does want to start a family. As such, will he tell Lily the truth, she who seems to need that sign from the universe to embark on this important step in their lives? Meanwhile, Robin receives what she considers an offer for her dream job, that as a news anchor. The problem is that the job is in Chicago. Leaving her four friends would be difficult enough, but she isn't sure if she wants to leave Don, who she is finally meshing with both professionally and personally. She turns to an unexpected source for advice. And Robin, Marshall and Lily, using psychology, talk Ted into dying his hair blond by telling him not to do it.