LOS ANGELES (AP) — Geoff Johns, the former president and chief creative officer of DC Entertainment, considered his sister akin to a superhero, but instead of otherworldly strength or special powers, her special gift involved her generous heart and sense of adventure.

"She always wanted to help people. She was very positive. She walked in a room and she just had energy," Johns said of 18-year-old Courtney, who was killed in 1996 in the TWA Flight 800 plane explosion off the coast of Long Island, New York.

"She was fearless," Johns added.

He's keeping the spirit of his sister alive with the new...