Credit: Kevin Winter/Getty Images Photo: Nathan Fillion on the Super Panel at Comic-Con 2010

Nathan Fillion and Comic-Con go together like Kate Beckett and turtleneck sweaters. With this year's Comic-Con just days away, we though we'd honor Nathan's undying commitment to nerddom by looking back at his top 5 most memorable Comic-Con moments. Enjoy!

5. Nathan Surprises the Browncoats

Firefly fans were beyond stoked when Nathan popped in on a Browncoat meeting back in 2009. Attendees were treated to all of Nathan's usual antics, and one lucky member an even got to take home his copy of Halo 3 Essentials. Watch his uber-cute surprise visit below.

4. Rainn Wilson Puts Nathan in a Headlock

Nathan got it handed to him at last year's Comic-Con when he challenged Super co-star Rainn Wilson to an onstage duel. Not gonna lie — we're a little disappointed in Nathan's lack of real-life superhero powers, but it's still pretty hilarious. And he's still ridiculously adorable.

3. Jon Huertas Gets Nathan's Sloppy Seconds

Things got a little naughty last year when Nathan and Jon began pulling schoolboy pranks on each other during the Castle panel. While reading a steamy passage from Heat Wave, Nathan decided it would be appropriate to cool himself down with an ice cube. Take a wild guess where that ice cube ended up!

2. Nathan References His

What would a Dr. Horrible panel be without some inappropriate shenanigans from Captain Hammer himself? If you were lucky enough to attend Comic-Con back in 2008, you'll probably remember when a fan asked the panelists to describe their favorite moment in the entire Jossverse (translation: Joss Whedon universe), to which Nathan quipped, "The hammer is my penis." If you don't get the joke, stop what you're doing and watch Dr. Horrible's Sing-Along Blog immediately!

1. Nathan Poses as Crazy Joss Whedon Fan

Classic Nathan right here, folks! Last year, he showed up incognito to the Joss Whedon Experience panel and proceeded to heckle Whedon for "playing favorites." The crowd goes absolutely wild when Nathan removes the mustache and reveals his true identity. It doesn't get any better than this!