Hannah John-Kamen chats with ET at San Diego Comic-Con 2026, after taking part in Marvel's Hall H panel. The actress, who plays Ghost in the MCU, reflects on originally thinking she'd be one-and-done after playing the villain 'Ant-Man and the Wasp.' Instead, she's now a major player in the franchise, after 'Thunderbolts' and (coming to theaters on Dec. 18) 'Avengers: Doomsday.'