Sandcastles in the Sand (Season 3, Episode 16).
Season Five Episode 2 called Double Date introduces us to Mustache Marshall and Lesbian Robin. This is when he learn about the gangs dopplegangers.
No
That is Stacy Keibler who played the role of Karina in episode 100 of How I Met Your Mother. She has appeared in numerous other shows as well such as Chuck.
Season 4, Episode 11 if I am not mistaken ;-)
I think you're looking for A Sweet Taste of Liberty.Season 1, episode 3.
Robin Sparkles is a real peson indeed she was a singer. Robin Sparkles returns to CBS on Monday. The teenage alter-ego of How I Met Your Mother's Robin Scherbatsky, Robin Sparkles had 15 minutes of fame in her native Canada during the '90s thanks to her hit single, "Let's Go to the Mall." That song, and wonderful music video, was the focus of perhaps the single greatest episode in How I Met Your Mother history, which is saying something.
Canada
"Let's go to the mall" comes in the same episode as the slap bet between Marshall and Barney is made, season 1 pal ;-)
Robin's music video is shown in Season 3, Episode 16, Sandcastles in the Sand.
Cobie Smulders plays the role of Robin in how I met your mother
robin
at birth
Season Five Episode 2 called Double Date introduces us to Mustache Marshall and Lesbian Robin. This is when he learn about the gangs dopplegangers.
imdb.com
No
Robin
Nope. The six major people (The five on screen and Bob Saget) are all credited with the same amount of episodes.