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Do I Know You? is the first episode of the fourth season of How I Met Your Mother, and the sixty-fifth episode overall.

Starring: Josh Radnor (Ted Moseby), Jason Segel (Marshall Eriksen), Cobie Smulders (Robin Scherbatsky)

With: Neil Patrick Harris (Barney Stinson)

And: Alyson Hannigan (Lily Aldrin)

Special Guest Star: Sarah Chalke (Stella Zinman)

Guest Starring: Lyndsy Fonseca (Daughter), David Henrie (Son)

Co-Starring: Kyle Archer (Mark Johnson), Heidi Lynne Herschbach (April), Alonza Maxwell (Bartender), Nicole Taylor (Sexy Blonde)

Contents 1 Plot Overview 2 Notes 3 Arc Advancement 3.1 Happenings 3.2 Characters 3.3 Referbacks 4 Trivia 4.1 The Show 4.2 Behind the Scenes 4.3 Allusions and References 4.4 Memorable Moments 5 Quotes

[edit] Plot Overview

[edit] Notes

[edit] Arc Advancement

[edit] Happenings

[edit] Characters

[edit] Referbacks

[edit] Trivia

[edit] The Show

[edit] Behind the Scenes

[edit] Allusions and References

[edit] Memorable Moments

[edit] Quotes