Nathan Fillion and Seamus Dever play around here during the PaleyFest 2012 panel of their hit ABC shoe, Castle.

Nathan Fillion of Castle is always a fan favorite. Anyone want to venture a guess why?

Always a fan favorite, Nathan Fillion shows off two 2013 People's Choice Awards in this photo.

New detective Sully desperately wants to be part of the team.

Officer John Nolan is the oldest rookie on the Los Angels Police force on The Rookie.

Mutant Enemy Productions' three-part web series, Dr. Horrible's Sing-Along Blog, is now 10 years old. Created by Joss Whedon, Jed Whedon, Zack Whedon, and Maurissa Tancharoen, the musical comedy stars Neil Patrick Harris, Nathan Fillion, Felicia Day, and Simon Helberg. The series follows Dr. Horrible (Patrick Harris), an evil genius who is determined to win the love of Penny (Day), but is constantly thwarted by hero Captain Hammer (Fillion). With a catchy soundtrack and infinitely clever dialogue and scenarios, Dr. Horrible's Sing-Along Blog is an all-around favorite.

Nathan Fillion, Alexi Hawley, Seamus Dever, and Jon Huertas get together online for the virtual San Diego Comic Con 2020.

The team must now try to understand why they were targeted and if there is a bigger plan in place. Meanwhile, Nolan must survive his last shift before his wedding to Bailey.

Nolan runs into action when they race against time to catch a new big bad terrorizing the force and city.

Nolan and Celina are approaching a highly intense situation with caution on the season premiere.

Nolan means business as in determined to get to the bottom of who plotted attacks and came after LAPD.

Nolan is a soon to be groom as he deals with his last shift before his wedding and tries to avoid trouble.