SAN DIEGO, California — There's a first time for everything, especially when it comes to Comic-Con. Even though the San Diego convention has become old hat for fans of the "Twilight" franchise, there are still some of the movie's stars who have never set foot on the Hall H stage — like Jackson Rathbone, for instance.

Rathbone made his Comic-Con debut this year, and during the cast's traditional meet-and-greet with fans waiting in line for the coming day's "Breaking Dawn" panel — which took place Thursday (July 12) — he found himself overwhelmed with the sheer scope of the San Diego show.

"This is my first time even being able to make it to Comic-Con. I've always been busy before," he told MTV News. "It's kind of bittersweet for me because I'm like, 'Look at all of this fun I've been missing!' This is ridiculous. This is amazing. San Diego is a great town to have this, with the beach right there ... everybody teeming on the streets, just having a great time in costume."

Many of Rathbone's co-stars are already old pros when it comes to dealing with the "Twilight" Comic-Con scene, like Ashley Greene. "It's insane every time when you meet different people. I don't think we'll ever be able to meet every single fan, but it's always a new adventure," she said. "Comic-Con is fun. It's a crazy energy. Everyone is always so excited and supportive of each other, so it's a fun place to be. I love it."

But the fun is coming to an end for the "Breaking Dawn" cast, as this year marks the last time "Twilight" will be at Comic-Con. It's not a notion that's lost on the stars themselves.

"I think it's more sad this year because it's becoming very real for us that this is coming to an end," said Nikki Reed. "We feel it, and the fans feel it. I think it's a really special night. This won't happen again."

Kellan Lutz, meanwhile, isn't ready to say goodbye to Comic-Con just yet. "It's the last one for 'Twilight,' but hopefully not the last one I get to attend," he said with a grin. "But it is bittersweet. It hasn't settled in yet."

Even if "Twilight" and Comic-Con are parting ways this year, the cast will always remember the fans who supported their story over the past several years.

"It's an incredible feeling," said Rathbone. "I just had this really wonderful girl from Hawaii hand me a gift bag and very sincerely with tears in her eyes said, 'Thank you for the last five years.' That kind of hit home. It's been five years of making all of these people happy with these films and these characters that they've really come to love. It just fills my heart with gratitude."

Stick with MTV as we bring San Diego Comic-Con to you with wall-to-wall convention coverage from the panels to the streets. Hosts Josh Horowitz and Steven Smith are onboard for live broadcasts on fan-favorite movies, comic creators, TV shows, cosplay, gaming and more!