When one teenager discovers his father's old camera, a video of his seventh party is found to be still on there. However, a glance in the corner of the screen tells him that something very strange has happened (or will happen) as he spots what looks very much like his teenage reflection in the mirror on the wall. Puzzled, he and his friends trawl through his father's old workshop and attempt to find the source of an odd clicking noise. It's then they discover a strange device hidden under the floor and papers for the construction of a temporal relocation prototype - in other words, a time machine. When they successfully manage to go back to yesterday, they begin to change various areas of their past which, consequently, has disastrous effects on all their futures. In a bid to get everything back to normal, they try to go back and 'unchange' everything - at serious mortal risk.
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