time travel into the past be tenuous at best a a topic . in this episode a man who have be think about the possibility and find himself at the date and location of the assassination of abraham lincoln . he try everything he can think of in the short time available to him with predictable result . of course and he be think to be quite mad . he be arrest and eventually remand to the very man he be attempt to stop . serling be bright enough to let him return to the present and but be the present the same . this be kind of a precursor to the time tunnel where time traveler on a weekly basis be give the same task and overcome what have already happen . unfortunately and the implication of the distortion of time and the future always negate the result . unless you have something like ray bradbury the sound of thunder .