The BBC has tweeted a new photograph of Benedict Cumberbatch and Martin Freeman in Victorian clothing from the “Sherlock” special that will be set in 19th-century England. The BBC released the first image from the special in November.

The photo release comes ahead of a “Sherlock” panel at Comic-Con on Thursday, where the speakers will include co-creator/executive producer/writer Steven Moffat, executive producer Sue Vertue and Rupert Graves, who plays Greg Lestrade. They will “discuss the latest adventures of Sherlock Holmes and his long-suffering faithful friend, Dr. John Watson,” according to the Comic-Con schedule. Moffat also appears at a Comic-Con panel on Thursday for “Doctor Who,” of which he is lead writer and executive producer.

In March, Moffat spoke about the “Sherlock” special, and confirmed that it would be set in the 19th century. He told Entertainment Weekly at the time: “The special is its own thing. We wouldn’t have done the story we’re doing, and the way we’re doing it, if we didn’t have this special. It’s not part of the run of three episodes.

“So we had this to do it — as we could hardly conceal — it’s Victorian. (Co-creator) Mark Gatiss and me, we wanted to do this, but it had to be a special, it had to be a separate entity on its own. It’s kind of in its own little bubble.”