Good friends from high school and some very talented young people in science, C.J. and Sebastian spends every spare moment they have in working on their latest invention; some backpacks that can carry them in time. When C.J.’s older brother, Calvin, is killed by a police mistake, the two young inventors decide to put to work the invention that is still completely unfinished for a desperate adventure to save Calvin. Soon, the two teenagers will discover that any action they have done over time has unexpected consequences now.