Season 6, Episode 13 | January 3rd, 2011
Marshall and Lily still not pregnant, go to see a fertility doctor, Dr. Stangel, who turns out to be Barney's doppelganger. After accepting that Dr. Stangel sis actually not Barney in disguise, he is able to examine Lily and finds she is very fertile, and that Marshall may be the problem. After failing to produce a sample at the doctor's office, Marshall races home for some privacy only to discover his parents are there having shown up unexpectedly for a visit. Unable to focus on his task with his parents there, he and Lily finally tell his parents the truth about what is going on. It turns out Marshall's sperm is fine and he celebrates his virility with the gang at the bar. Knowing his parents are awaiting his results Marshall goes outside to call his dad with the good news, but there is no answer. Meanwhile, Robin has started her job at World Wide News as a researcher and discovers that her old co-anchor Sandy Rivers is hosting one of their shows, "Hardfire". Sandy shows the staff a slew of embarrassing clips from Robin's past including "Robin Sparkles" In the end, Robin is able to embrace the teasing and deflates the power Sandy had from picking on her.