FALL FINALE: The first half of the Gotham season ends with a showdown of evil armies, and the promise by the show’s producers that not everyone will come out alive. But we know most of them will, because they show up in the comics – so no matter how bad it looked last week for Alfred, Jim Gordon, and the future Batman, all of whom were captured, beaten, stabbed, or some combination of the three, they’re destined to live to fight another day. Others, though, indeed are at risk&h