The future

Two Star Saviours of different time periods of history, yet something is off. Under mysterious circumstances, the two saviours found themselves swapped in time, the first star saviour is sent to the future while the second is sent to the past. They have no choice but to live the other's Adventure, fated to meet each other someday. But in the meantime, how much will history change when the so called Stratosfear and the second coming of Star Saviour are not where they're supposed to be in the first place?