Time Travel (self) – The ability to travel back or forth through time.
Kang the Conqueror (Marvel) is the most important time traveler in the Marvel universe.
Superboy (DC) can travel in time but cannot change the past as the following comic book page demonstrates (Superboy V1 #85).
The Time Trapper (DC) is probably the most powerful time traveler in the DC universe.
The Flash rarely if ever tries to change the past with his cosmic treadmill. The Flash mostly travels to the future.
Doctor Doom (Marvel) used his own time platform a great deal in his early career but has become more cautious of time travel in his latter career.
Kang’s Time Chair (Marvel) is just one of many technologies Kang uses for time travel.
The Legion of Superheroes-Time Bubble (DC) is used by the Legion of Superheroes from the 30th century to recruit Superboy from the 20th century.
Rip Hunter Time Master has a Time Sphere and the series revolves around time travel.
The Time Machine (Dell) is a comic book version of the movie which in turn is a comic book version of the movie. The movie and comic book are inspired by the H.G. Well’s book of the same name.
Various time machines are shown in the Star Trek and the Legion of Super Heroes.
The Atom (DC) often used the Time Pool to have adventures in the past during the Silver Age. The Atom adventures did teach a little history unlike most such adventures in comic books (The Atom V1 #3).
Captain Sprocket fights Mr. Clock who can jump five minutes into the future in Archie’s Madhouse #45.
Gary Seven travels from the future to the 20th century in Who’s Who in Star Trek #2 (DC).
Great Race of Yith – Field Guide to Cthulhu Monsters
In “Industria” Heavy Metal #282, a time traveler creates a time traveling toilet.
Tales to Astonish (Marvel) featured several time travel stories with a twist!
Tales to Astonish V1 #3
Tales to Astonish V1 #11
Tales to Astonish V1 #20
Tales to Astonish V1 #29
Tales to Astonish V1 #33
Tempus Twins – Creature Collection II. Dark Menagerie
Time Tunnel #1 (Gold Key)
Chronos – Clocks – DC Heroes-DC Technical Manual
Judge Dredd – “The Time Machine” – 2000 AD #889
Mother Earth – 2000 AD #871
“Only Time Will Tell”- Weird Fantasy #13 (EC)
Poseidon – Aquaman V1 #17 (DC)
Rip Hunter-Time Backpack – DC Heroes-DC Technical Manual
Superman uses a cosmic treadmill like the Flash instead of flying in Action Comics #992.
Tardis 2 – Second Doctor Sourcebook
Tardis 3 – Third Doctor Sourcebook
Tardis 4 – Fourth Doctor Sourcebook
Tardis 5 – Fifth Doctor Sourcebook
Tharg’s Future Shocks – “Bone Shaker!” – 2000 AD #715
Time Flies – 2000 AD #1015
Vector 13 – “Operation Mordred” – 2000 AD #968
The Marvel universe gives Old Man Logan their opinion of trying to travel to the past in order to change events in Old Man Logan #19.