Robot universe
The "robot universe" is the name given[1] to the reality dominated by the war between the Autobots and the Decepticons. It is also home to the superhero Spider-Man, the international peacekeeping team Action Force, and just about any robot or somebody in an iron suit.
Timeline
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1984
The February 7, 1984 edition of the Daily Bugle reported a "stop press" story on the sudden eruption of Mount St. Hilary 
in Oregon –an eruption which, unbeknown to the general public, had reawakened the Ark and restarted the conflict between the dormant Autobots and Decepticons.[2]
1985
1986
1987
Wanted: Galvatron — Dead or Alive!
Hunters
Fire on High!
Vicious Circle!
2007
Wanted: Galvatron — Dead or Alive!
Headhunt
2008
2015
2020
If This Be Sanctuary?! Rime of the Ancient Wrecker!
24th Century
What Fools These Immortals Be!
Westphalling
The official stance is that The Transformers is not canon to the mainstream universe of Marvel Comics. 
However, the series' events take place in some kind of Marvel universe, due to the appearances of Spider-Man, Nick Fury, Dazzler, U.S. 1, the Savage Land, and others. As a result, Marvel considers the universe of Transformers U.S. to be Earth-91274 , and the universe of the UK version to be Earth-120185.
This, however, isn't fun, and the stance of The Transformers UK Appendix is to take in-story events and crossover character cameos at face value, building up a shared universe in the style of the Tommy Westphall hypothesis (and flying in the face of Dwayne McDuffie's original intent when coming up with it).
- The Transformers story "Prisoner of War!"
prominently features Spider-Man, as well as Robbie Robertson and the Daily Bugle.
- Spider-Man fought Iron Man 2020 in "Man of the Year", while namedropping Iron Man and Captain America.
- Iron Man and Captain America appeared in Matt and the Cat.
- Iron Man 2020 fought Machine Man in "Rime of the Ancient Wrecker!"
- Transformers crossed over with Action Force in "Ancient Relics!" .
- Spider-Man fought Iron Man 2020 in "Man of the Year", while namedropping Iron Man and Captain America.
- Spider-Man appeared in a number of Combat Colin strips. Colin also prominently fought Doctor Doom, and once met the Autobot Blaster.
- King Nonose and the Robot Inventor of Robo-Capers once tussled with Colin.
- Colin and Steve also fought the Gwanzulums, which cropped up to trouble the Doctor, the ThunderCats, and the Real Ghostbusters.
- Transformers also gave the world Death's Head, meaning that some or all Death's Head comics are in some way canonical. His career saw him face the Doctor, Dragon's Claws,
the Fantastic Four, Iron Man 2020, She-Hulk... though straying too far down this route yields the retcon that D.H. wasn't originally from the "robot universe" at all!
From outside sources
- Received wisdom tells us that both Rocket Raccoon and Planet Terry are Earth-616 characters, which means for our purposes, their stories are in the "robot universe".
- A version of Hercules also exists in Earth-616, though the Hercules in Hercules is classified as a version from Earth-829 as part of the general categorisation of all depictions of the future as alternate realities.
