The star appeared on stage with Batman v Superman: Dawn of Justice co-stars Henry Cavill and Gal Gadot
Credit: Albert L. Ortega/Getty

Since Ben Affleck and Jennifer Garner announced their plans to divorce on June 30, the actor has jetted from the Bahamas to Atlanta and back home to Los Angeles.

And on Saturday, he made his first public post-split appearance at San Diego Comic Con.

Joining co-stars Henry Cavill, Gal Gadot, Jesse Eisenberg, Amy Adams and director Zack Snyder on stage in a packed-to-the-brim Hall H, Affleck appeared to be in a serious mood and was still sporting his wedding ring.

Affleck was part of the Warner Bros. panel, which also featured appearances by Hugh Jackman, who stars in Pan; Armie Hammer, who is featured in The Man from U.N.C.L.E.; and the cast of Suicide Squad.

While at the panel, Affleck opened up about the daunting task of taking on an iconic superhero role.

“If I thought too hard about the actors who played the part before, I couldn’t take the job,” he said. “George Clooney did great, Christian Bale … I talked to Zack and I was like, “Are you sure, you know?” And he said “I have this vision, I have this idea for the guy and you’re perfect for it.” [I said] What do you mean? [He’s at] the end of his rope, he’s a burn out [laughs] … The truth was that he took me through he process of creating this character that I quite almost didn’t see and at the end of it I was astonished … That was exactly what you pitched me and I wasn’t sure I was doing it.”

Ben Affleck Spotted Without His Wedding Ring

Affleck continued, “Before I started the movie I was getting my kid’s Halloween costume and my son is really into Batman, and we went to a costume store in Los Angeles and it was pretty empty and I was in the aisle and I hear this ‘Oi.'”

“I turned around, it’s Christian Bale who’s the sweetest guy ever and there he and I are standing in the Batman [aisle]. I said, ‘Look man, you’re the best, what do you think?’ [He said] ‘Make sure you could piss in that suit.’ ”

He later clarified “Christian Bale was also buying his son the suit. He doesn’t just hang out [in the Batman aisle].”

While onstage, Affleck chuckled and chatted with Cavill, but for the most part looked very serious. After the panel, the actor made a stop at Hard Rock Hotel San Diego, where he was still sporting his wedding ring and shook hands with an excited fan.

Last summer, Affleck also made an appearance at the annual event with Cavill and Gadot to unveil a 20-second sneak peek at the film, which had not wrapped shooting at the time.

In PEOPLE’s current issue, multiple sources reveal what went wrong in the relationship after 10 years of marriage and three children together.

“They have both been very open about their marriage struggles,” said one friend. Added another: “[It] was inevitable. If there’s any surprise, it’s how long it took to happen.”

For more on why the couple split and their plans for co-parenting, pick up the current issue of PEOPLE on newsstands now.