Time travel

Time travel is, as the name suggests, the process of travelling through time.

By space-time vessel or other time machine
Time travel of this kind commonly requires a great deal of power. The Time Lords converted a star into a black hole in order to achieve time travel (DW: The Three Doctors) and used the Eye of Harmony thereafter (DW: The Deadly Assasin). The Imperial Daleks under Davros, who already had limited time corridor technology, expected to do the same. (DW: Remembrance of the Daleks). Following the (presumed) loss of the Eye of Harmony, the Doctor use the Cardiff rift to "re-charge" his TARDIS. (DW: Boom Town)


 * Travel using time vessel commonly involves the Time Vortex.

Other technological means

 * Osmic projection, a means used by the Sontarans. The Doctor described this methd as rather limited in its range. (DW: The Time Warrior)


 * Time Scoop technology enabled the user to transport other people and objects remotely. But without any ally on the other end to return one, it may leave the user stranded in another time period with no way to return.


 * Time corridor technology used by both the Daleks (DW: Resurrection of the Daleks, Remembrance of the Daleks) and Osirians and the Borad.


 * Principally a time viewer. a quantum imager enabled one to observe and to a limited degree, communicate with people in the past. (BFBS: The Least Important Man)


 * Pushing energy into warp drive to create a time window. (DW: The Girl in the Fireplace)


 * A warp drive accident fractured one unfortunate individual, Scaroth into "fragments" scattered through various eras of time and linked by telepathy. (DW: City of Death)

By psychic power or other natural ability

 * The Eight Legs could teleport as easily through time as through space. It seems that the renegade Time Lord K'anpo Rimpoche could do the same. (DW: Planet of the Spiders) Bilis Manger could also also teleport at will through time and space. (TW: Captain Jack Harkness, End of Days)


 * Fenric could transport other living beings via time storm. The people displaced by the time storm often believed they had caused the time storm, themselves.(DW: Dragonfire, Silver Nemesis, The Curse of Fenric'')

By space-time anomaly

 * Travel via time rift is possible, but sometimes chancy.
 * Possibly a warp ellipse can make time travel possible. (DW: Mawdryn Undead)

By unexplained methods

 * Edward Waterfield and Theodore Maxtible attracted the attention of the Daleks while experimenting with static electricty and mirrors.
 * The mysterious Gateway situated in the void between N-Space and E-Space provided access different times and realities, someimtes through mirrors. Again, the exact process remains unknown. (DW: Wariors Gates)

Taking "the long path"
Some individuals, by nessecity, may seek to take what the Doctor once described as "the long path" (DW: The Girl in the Fireplace) spending hundreds of thousands of years patiently waiting to return to a desired time. (NA: Birthright) A less arduous method would involve cryogenics or some other form of life suspension.