- Josh Radnor (Ted Mosby)
- Neil Patrick Harris (Barney Stinson)
- Jason Segel (Marshall Eriksen)
- Alyson Hannigan (Lily Aldrin)
- Cobie Smulders (Robin Scherbatsky)
- Cristin Milioti (Tracy McConnell)
How I Met Your Mother — S1E20
Episode: Best Prom Ever
Air Date: 2006-05-01
Runtime: 22 min
Overview
Lily, Barney and Robin attend a high school prom to scout out a potential band for Lily and Marshall's wedding reception. In order to get in Lily and Robin pretend to be the dates of two kids who were going alone. Ted and Marshall are back at the apartment where they are preparing the invitations to be sent out.