“The Eternals” have arrived. The first film announced at Marvel’s San Diego Comic-Con presentation on Saturday, unarguably the hottest ticket of the weekend, confirmed months of speculation by unveiling its cast: Angelina Jolie, Salma Hayek, Richard Madden, Brian Tyree Henry, Kumail Nanjiani, Lauren Ridloff and Don Lee will star as 35,000 -year-old aliens.