There have been multiple Transformers crossovers with G.I. Joe. By publisher:
- G.I. Joe and the Transformers - the 4-issue mini-series published in 1986.
- G.I. Joe Starring Snake-Eyes and the Transformers - five issues of the regular G.I. Joe book published in 1993, featuring the return of Megatron.
- Generation 2 - the 12-issue series published in 1993-94, featuring prominent appearances by the Joe team.
- Ancient Relics / Action Force - one issue of the Marvel UK G1 book featured Action Force, the UK incarnation of G.I. Joe; the story continued in four issues of the Action Force book.
- Transformers/G.I. Joe - the World War 2 era mini-series published in 2004.
- Transformers/G.I. Joe: Divided Front - the planned followup, of which only one issue was published.
Devil's Due Publishing
- G.I. Joe vs. the Transformers - series published in 2004, with the Autobots and Decepticons as Cobra vehicles.
- G.I. Joe vs. the Transformers II - series published in 2005, with time-travelling groups of Autobots and Decepticons.
- G.I. Joe vs. the Transformers: The Art of War - published in 2006, featuring the rise and fall of Serpent O.R.
- G.I. Joe vs. the Transformers: Black Horizon - published in 2007, featuring the coming of Unicron to Earth.