Thomas steals a prototype time machine from his employer, the Moore family. He is intent on changing past events which caused him and his entire family to be indebted to the Moore family for the last 100 years. Jack discovers the theft and chases Thomas through time; once Jack finds Thomas, a malfunction propels them further back into time. Meanwhile, Tara is in a race to track down the inventor and convince him to build another prototype. Through her investigation, she discovers the terrible side effects of time travel. Ignoring the danger she takes the risk and finds herself trapped in time.