Love Actually star Thomas Sangster (second left), the voice of Ferb, with co-stars Mitchel Musso (Jeremy), Vincent Martella (Phineas) and Alyson Stoner (Isabella) at the launch of Phineas and Ferb.

Disney’s animated hit “Phineas and Ferb” will return to San Diego Comic-Con this month with a panel, merch and a pop-up photo experience. Timed to the show’s recent revival, “Phineas and Ferb” will ...