This is a tale already better told by other shows like Time Tunnel, 7 Days, Eureka, Star Trek's "The City on the Edge of Forever" and the classic novel "The End of Eternity" by Issac Asimov. The basic plot is to go back and change the past in order to change the future. The contradictions in the story are tedious and the plot twists gratuitous. The time travel device is unstable and random, so the 'window' opens for a short time and random location that just happens to give an opportunity to make the major change in the present by killing somebody that kills somebody else that causes the present day bad guy to do what he did, which he does to cause the intervention in the past so he doesn't do what he did, which he did because he doesn't like how events naturally unfold in his life, which if changed he will not know to cause the intervention... this is the classic grandfather paradox we other time travelers know is a loop in time that destroys itself so it never happens. The good guys quickly come up with a poorly thought out plan as the clock ticks down, and they just happen to have the period costumes, maps, old license plate records and obscure biographies to lurch through their mission, with suicide pills in case they don't make it back, since their mere presence in the past will have unpredictable results, (unless they become even more disruptive unidentified corpses), while home base has a magic predictor machine that instantly guesses what will happen. Of course, cold blooded murder is avoided at the end by changing the twice removed bad guy from a career criminal and murderer into a war hero, and saving his sister from dying to boot, which will cause even more disruption by inserting a dead person into the new timeline. The pilot ends with a paradoxical cliffhanger as the maniacal military man comes completely prepared for the random switch to another window and he steps into the past to cause some major change in history. I'm only guessing, but he probably shoots Hitler... or maybe his own grandfather. Tune in to the next episode as our heroes,magically protected by the unstable time portal from the effects of any changes in history,save the day with luck, guts and good looks. No stars for a badly written story and cliché acting.
