I want a time travel movie where the protagonist goes back into the past to Make Things Right and spends the whole rest of the movie after the time jump in the bathroom because their stomach can't handle the microbes in the water and food
Time travel is actually quite easy to invent. Ridiculously easy. Far more people have the capacity to stumble over the knack of time travel than to comprehend the effect of the earth’s 30km/s orbital velocity in combination with the sun’s 250-odd kps galactic orbital motion. Interstellar space is LITTERED with inventors who discovered, briefly, that a flux capacitor recharges in just *slightly* more time than the length of time a human can hold their breath in vacuum.