A pre-existing Time Portal is a way to introduce Time Travel to a series without opening the Pandora's Box of "why didn't they just go back in time and stop the bad guy". These can be random, appear and disappear in a predictable way, or be permanent. A Time Portal provides a direct gateway between two points in space and time is another variation.Losing the signaler or missing the prearranged portal can require past travelers Writing Back To The Future to get home. Can also being used as a "time scoop" to bring things from the past into the present without going there. Timecop-type machines are a cross between the Back to the Future-type and the Terminator-type the traveller is sent back by a machine that does not come with him, but has some sort of way (such as a remote or prearranged time portal) to make a trip back, utilizing the future time machine.(And this is sometimes precluded by time machines being too big, or the rules not allowing you to take things, or just time machines, with you.) Sometimes these only allow backwards trips to start with. Once back in time, the person has no way back to the future besides The Slow Path, unless they can somehow build another device, or if they were able to bring an entire additional time machine with them to leave behind on that trip also. Terminator-type machines usually involve some sort of big device that projects a traveller back, but does not come with them.Basically it's a vehicle that can go anywhere in 4 dimensions. A TARDIS-type machine works like a Back to the Future-type one except not only can you program it to go anywhere in time, but also anywhere in space.This is pretty much the most common type, possibly having to do with the fact that one of the earliest time travel stories ( The Time Machine) used this type. When a traveler wants to go back, they use the machine again. With the Back to the Future-type machine, one simply gets into a vehicle of some sort, and the vehicle is transported to a certain time.The type of machine can combine with any of the different ways of experiencing the process of time travel and with the various degrees to which the past can be changed. Time Machines in fiction can boil down to a few simple types. A Time Machine is the main prerequisite for Time Travel and all the other fun that goes along with it.
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