'Big Bang Theory' Season 7 Spoilers: Stephen Hawking Theme Song Video [WATCH], Melissa Rauch Moderates Comic Con 2013 Panel

Arguably TV's hottest sitcom is CBS' The Big Bang Theory. The show quickly garnered rave reviews, followed by massive ratings. Now, every year at Comic Con, the cast and writers from the show appear at the annual event to big fanfare. Comic Con 2013 in San Diego was no different as a number of secrets and spoilers were revealed during the show's Comic Con 2013 panel. Among the surprises was an appearance from Melissa Rauch, who moderated the panel. The Emmy nominated show returns for season 7 on September 26 at 8pm on CBS.

At this year's Comic Con, the show's panel featured mostly the writers. According to The Hollywood Reporter, six writers appeared along with the show's science adviser David Saltzberg. Season 6 showrunner Steve Molaro revealed a couple of tidbits for season 7.

Molaro told fans in attendance that in season 7 Leonard will be see on the ship after leaving with Stephen Hawking on a research trip. In addition, Bernadette and Amy will take their first trip together and Raj will begin to talk to women sober. It was also suggested that fans could see Raj's parents in person, instead of via Skype.

Johnny Galecki and Melissa Rauch also surprised those in attendance by appearing in person. Rauch reportedly moderated the panel. Are there any storylines you would like to see come to fruition in season 7? Do any of the ones above get you excited for next season? Comment below with your thoughts.

Another treat for fans was the opening message to this year's panel. A pre-taped message was shown to fans with Stephen Hawking singing the show's theme song. You can watch the video below.