Some superheroes fly while others take the escalator. Photo by Chris Stone

Fresh off setting record ratings in its seventh season premiere last weekend, HBO Friday thrilled “Game of Thrones” fans at Comic-Con International at the San Diego Convention Center with a 60-second trailer for upcoming episodes.

A fan laughs as a zombie from “The “Walking Dead” appears in her selfie. Photo by Chris Stone

Sunday’s episode drew 16.1 million total viewers, a 50 percent increase over the season-opening show last year and the most-watched season premiere in HBO’s history. According to news reports, the airing also generated 2.4 million tweets.

Among the cast members who took part in the “Game of Thrones” panel were Alfie Allen — who brought his dog — Jacob Anderson, John Bradley, Gwendoline Christie, Liam Cunningham, Nathalie Emmanuel, Conleth Hill, Sophie Turner and Isaac Hempstead Wright.

The promotional clip aired during the panel included the memorable lines, “If we don’t band together, we will die,” and “Everyone is your enemy — everyone is your friend.” It also teased a potential union between two important characters.

Not far from the convention center, HBO has set up a Westeros experience for fans that depicts the fictional land where the series is set. The Westeros attraction is next to the Omni Hotel in the Gaslamp District.

“Game of Thrones” wasn’t the only session packing Hall H, which actually had some empty seats Thursday as Comic-Con opened for its annual four-day run.

Gina (left) and Carla Leanzo of Northfolk, Virginia, pose as Lilith and Mad Moxxi of “Borderlands.” Photo by Chris Stone

Other sessions were a 10th anniversary panel on “The Big Bang Theory,” where much of the discussion centered on Jim Parsons’ socially awkward character Sheldon proposing to longtime girlfriend Amy. Kaley Cuoco, who portrays Penny, admitted to crying during the taping of the scene, a sentiment shared by other members of the cast.

The cast also led the audience in singing “Soft Kitty,” the lullaby Penny has to sometimes sing to put Sheldon to sleep.

The AMC shows “The Walking Dead” and “Fear the Walking Dead” were also showcased.

Panels run from 10 a.m. to midnight at the convention center, Central Library, Hilton Bayfront Hotel, the Horton Grand Theatre and the Marriott Marquis Hotel and Marina.

Actors in the Gaslamp Quarter promote the upcoming History Channel series “The Vikings.” Photo by Chris Stone

Organizers strongly suggest using public transportation.

A free shuttle bus service is operating 24 hours a day, stopping at 63 locations in downtown, Mission Valley, Harbor Island and Shelter Island through Sunday evening.

The Metropolitan Transit System announced that Green Line trolleys will run every 7 1/2 minutes between Qualcomm Stadium and the 12th and Imperial Transit Center through Sunday. Blue and Orange line trains will increase in frequency during peak travel times, according to the MTS.

The transit agency said passengers can use its new Compass Cloud mobile app to purchase ride tickets in advance. The MTS also has 22 bus routes with downtown stops.

— City News Service

Feline characters pose in the front lobby of the San Diego Convention Center. Photo by Chris Stone
Superheroes have to follow the traffic signals in front of the San Diego Convention Center. Photo by Chris Stone
A “Batman” fan looks over the comic books on sale in the exhibit hall. Photo by Chris Stone
A young girl shows off her pretty face freed from her scary mask. Photo by Chris Stone
A man dressed as a Muppet walks through the crowds. Photo by Chris Stone
A man made up as the Joker from “Batman” poses in front of the Cinema Makeup School booth. Photo by Chris Stone
A young boy looks over comics in the exhibit hall. Photo by Chris Stone
Fans examine the artwork in the “Star Wars” booth of the exhibit hall at Comic-Con. Photo by Chris Stone
A fan looks through the small posters that he bought. Photo by Chris Stone
Andrea Seale of Burbank poses as Demogorgon from “Stranger Things.” Photo by Chris Stone
Cosplayers from different genres talk in the Sails Pavilion. Photo by Chris Stone
Fans line up for autograph sessions at Comic-Con on Day 2 om 2017. Photo by Chris Stone
The creator of Steven Universe and actors greet fans. Photo by Chris Stone
Authors of the Guild Web Series greet fans and sign autographs. Photo by Chris Stone
A Supergirl takes a break in Comic-Con action to take a call. Photo by Chris Stone
Kit Brown of Poway walks through the halls with his pants around his ankles as the Steve Martin character in “The Jerk.” Photo by Chris Stone
Fans get their photos taken holding a light saber at the “Star Wars” booth. Photo by Chris Stone
A Justice League car is on display in the exhibit hall at Comic-Con. Photo by Chris Stone
A fan poses with a Slimer statue from “Ghostbusters.” Photo by Chris Stone
Artwork is one of the items that Comic-Con shoppers look for. Photo by Chris Stone
A fan laughs as a zombie from “The “Walking Dead” appears in her selfie. Photo by Chris Stone
A fan dresses as Lumiere from “Beauty and the Beast.” Photo by Chris Stone
People wearing costumes pose and laugh as sign-holders warn of eternal damnation. Photo by Chris Stone
Wherever there is a cosplayer, there are fans who want to photograph his/her creation. Photo by Chris Stone
A man with a colander with lights strapped to his head waits between panels. Photo by Chris Stone
Fans look at professional silicone masks in the exhibit hall. Photo by Chris Stone
A man dressed as the devil listens to protesters warning of eternal damnation. Photo by Chris Stone