In the series, time travel is made possible using a drug or the pre-set co-ordinates of a time machine, although parts 4 and 5 introduced other means of time travel between dimensions.
In the series, time travel is made possible using a drug that sends the person into the conscience of a relation, or the pre-set co-ordinates of a time machine. Although parts 4 and 5 introduced other means of time travel between dimensions.