For me, the update to the 1970s took this made-for-TV movie too far away from the original
novel. For example, the Traveller (now a rocket scientist called Neil Perry) explains the
workings of the machine with gibberish, whereas the original Traveller expressed himself with
up-to-date mathematical terminology. The travel to the Salem witch trials and the California
gold rush were also off the mark, as was the dreamy Weena who immediately speaks English.
— Michael Main
Well, in principle, it utilizes a electromagnetic force field to molecularly reconstruct
the space-time continuum.