Charlene Amoia

It's the holiday season at St. Denis. Alex and Ron care for a patient whose diagnosis is not what it seems. Joyce enlists Serena's help to boost St. Denis' online presence. Bruce and Matt help a Santa in need.

When Beckett and her team burst into an apartment on a murderer's trail, they see Castle standing over a dead woman's body holding a gun; Beckett arrests Castle as he asserts his innocence.

The gang tries to help Ted when the perfect girl is finally available, and Marshall takes action when he finds a letter written by his younger self.

When the gang finds out that Ted is taking his doctor on a date, they try to convince him, through examples of their own toxic experiences, why it's never a good idea to get into a relationship with someone you see on a regular basis.

When Barney is about to complete the perfect week - landing seven different girls in seven days - the gang roots him on in order to forget about their own miserable week.