Houdini & Doyle (2016)
S8E9 Lobster Crawl
Episode Overview
Robin is resolute in her quest to win Barney back at any cost. At the same time, Ted takes on the role of Marvin's nanny, prompting Marshall and Lily to notice that Ted seems to be using baby Marvin as a substitute for his lost project, the GNB building.
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S8