Castle kicked off its Comic-Con panel today with a look at the opening of season four. It featured a bleeding Kate Beckett being wheeled into the hospital, along with other teases:

What else was revealed during a fun chat with cast members Nathan Fillion, Jon Huertas (aka Esposito), Seamus Dever (Ryan) and Molly Quinn (Alexis)?

• A Ghostbusters-themed Halloween episode is in the works.
• Episode 4.02 will have a "superhero theme,” Fillion said. It will feature a masked vigilante and a comic book store crime. 
• Dever teased that Kevin and Jenny “will be heading toward some matrimony.” Expect wedding planning, a bachelor party, and “fighting for the best man spot” between Castle and Esposito.
• Alexis will be applying for Stanford, causing problems for her dad and dating a new boy.
• A new Nikki Heat novel will come out out in October.

Titled "Rise," the season four premiere airs on September 19.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.