Hollywwood Reporter has some more details on what to expect from ABC after ABC Publicity sent out a tweet saying that “S.H.I.E.L.D.,” “Once Upon A Time,” and “Once Upon a Time in Wonderland” would be attending Comic-Con.

Friday July 19th:

Marvel’s Agents of SHIELD (ABC): Panel to include Joss Whedon, Marvel’s head of TV Jeph Loeb and additional special guests.

Saturday July 20th:

Once Upon a Time (ABC): Panel to feature cast and producers.

Once Upon a Time in Wonderland (ABC): Panel to feature cast and producers.

It’s safe to say that Clark Gregg will most likely be taking part in the “S.H.I.E.L.D.” panel and actress Ming-Na Wen has been tweeting up a storm recently about San Diego Comic-Con. What’s interesting about the two “Once Upon A Time” panels is the fact they’re the same day. Will they be back to back panels? Will it be a joint panel? I can’t imagine they’ll be at the same time but separate rooms. You’re trying lure fans of one show to a spinoff, you shouldn’t make them choose between old and new.

What do you think?

UPDATE: More info via Seat42F

ABC will be bringing star power to Comic-Con 2013, with its returning fan favorite “Once Upon a Time,” as well as two new highly anticipated series debuting this fall, “Marvel’s Agents of S.H.I.E.L.D” and “Once Upon a Time in Wonderland.”

On Friday, July 19, Marvel Television will introduce fans to their first live action television epic with their new ABC series, “Marvel’s Agents of S.H.I.E.L.D.,” featuring a panel with executive producer Joss Whedon and Marvel’s Head of Television and series executive producer Jeph Loeb. The show will also be spotlighted at the Marvel Entertainment Booth on the Convention Center floor throughout the entire weekend, with special surprises to be announced!

Saturday, July 20 is a day filled with magic, as the executive producers of ABC’s “Once Upon a Time” and their newest drama, “Once Upon a Time in Wonderland,” will be in attendance with their casts, participating in panels and press room interviews. ABC’s booth on the Convention Center floor will highlight both shows and host autograph sessions with each cast.

Fans can also enjoy the enchantment of both “Once Upon a Time” and “Once Upon a Time in Wonderland,” as they catch rides throughout the city on one of several ABC branded pedicabs. We hope you take a ride on the Evil Queen’s carriage, The Jolly Roger or Alice’s magical mushroom!

Specific times and locations for all events to be announced at a later date.