Barney's efforts to hook up with women are being thwarted by a mysterious woman from his past. Barney and the gang must sift though his many past flings in an attempt to find out who she is.
Elenco:
Cobie Smulders
,
Josh Radnor
,
Neil Patrick Harris
,
Alyson Hannigan
,
Jason Segel
,
Bob Saget
,
Britney Spears
,
Candice Accola
,
Cristin Milioti
,
David Henrie
,
Lyndsy Fonseca
.
