LIAM O CONNOR SHOULD HAVE DIED AT SEA IN 1912. MADDY CARTER SHOULD HAVE DIED ON A PLANE IN 2010. SAL VIKRAM SHOULD HAVE DIED IN A FIRE IN 2029. YET MOMENTS BEFORE DEATH, SOMEONE MYSTERIOUSLY APPEARED AND SAID, TAKE MY HAND . . . BUT LIAM, MADDY AND SAL AREN T RESCUED. THEY ARE RECRUITED BY AN AGENCY THAT NO ONE KNOWS EXISTS, WITH ONLY ONE PURPOSE - TO FIX BROKEN HISTORY. BECAUSE TIME TRAVEL IS HERE, AND THERE ARE THOSE WHO WOULD GO BACK IN TIME AND CHANGE THE PAST. THAT S WHY THE TIMERIDERS EXIST: TO PROTECT US. TO STOP TIME TRAVEL FROM DESTROYING THE WORLD . .