The gang discovers that Robin's been hiding a huge secret, but they have no idea what it is. Marshall thinks she is married, and Barney thinks she was a porn star.
Starts: Josh Radnor, Jason Segel, Cobie Smulders, Neil Patrick Harris, Alyson Hannigan, Courtney Abbiati, Candace Kroslak, Wayne Nickel, Rachel Specter, Tara Brook