In Alfonso Cuaron‘s Gravity (Warner Bros., 10.4), Sandra Bullock plays an astronaut, Dr. Ryan Stone, struggling with a do-or-die situation that’s initially beyond her technical abilities. When high-speed debris destroys a space shuttle she’s manning with two others (including George Clooney‘s Matt Kowalski, a space-flight veteran), Stone not only has to survive with limited air but somehow return to earth — a tough order. In this sense Bullock is playing (I know how this sounds but it’s true) a variation on Doris Day‘s role in Julie (a terrified stewardess has to man the controls of a plane that has lost its pilot and co-pilot) and Karen Black‘s in Airport ’75 (a terrified stewardess has to fly a crew-less 747 before Charlton Heston can board and land it). Gravity is miles above and beyond these two mediocre films, technically as well as dramatically, so I’m not trying to diminish Cuaron’s film by making this comparison. Gravity is a brilliant experience. But Bullock is essentially playing, like Black and Day did earlier, a novice who has to grim up and find inner steel when the going gets tough. And the fact of the matter is that Black, Day and Bullock’s performances are roughly similar with much of the emphasis on “oh my God, I don’t know if I can handle this…what am I going to do?”