X-Factor Vol 3 Deathlok Steve: A Summary
Overview
"Deathlok Steve" refers to the Steve presented in a universe in which Wanda wished for "no more humans", which caused most of humanity to die or mutate, including Steve. Steve becomes a cyborg who now only cares about eliminating humanity and calls himself "Deathlok". Tony, meanwhile, was off-planet when this happened, meaning he was physically unaffected by Wanda's spell and has spent all of his time since his return leading a resistance effort while also miserable and drinking. This is a great universe for angst.
Pulling back, X-Factor, which features this universe, is a comic about a mutant named Jamie Madrox (Multiple Man), who leads a mutant detective agency. There is an arc in which he gets killed and starts finding himself waking up in a different alternate universe every time he does. One of these is the Deathlok universe, in which Tony finds Madrox but is then drawn by Steve into a fight. Madrox eventually makes it back to his own universe (616), though Deathlok and some other bad guys get pulled over to 616 with him. Deathlok is eventually killed by Polaris while trying to do bad guy things.
If you ONLY care about the Steve/Tony aspect, you can read X-Factor Vol 3 #231 and absolutely nothing else. However, Steve/Deathlok also shows up in #232 (where he's shown coming over to 616) and #241 (where he dies while fighting against members of the X-Factor team), if you want to see all of his available content. He is not mentioned in any of the surrounding issues (I checked).
All issues covered by this blog for X-Factor Vol 3 can be found here.
Issue-by-Issue Synopsis
[XF #229] Madrox is killed and finds himself in another universe. Then he gets killed again.
[XF #230] Madrox finds himself in yet another universe, which he realizes has giant Iron-Man-shaped Sentinels.
[XF #231] Tony captures Madrox and wants his help in escaping this universe because he's tired. However, Steve-as-Deathlok comes and attacks them. Steve and Tony exchange many words and Steve apparently tolerates Tony calling him "Steve". Madrox dies again and wakes up in yet another universe.
[XF #232] Madrox eventually gets back to 616 with the help of the other universe's Doctor Strange (who is also Madrox), but the portal is shown to pull Deathlok Steve and some other bad guys over to 616 as well.
[XF #233-240] The X-Factor team investigates things and has team drama. (These are not relevant issues from a Steve or Tony perspective.)
[XF #241] Steve and the other bad guys fight the X-Factor team, during which Polaris forces Steve's gun to shoot himself; he dies.
[XF #242] More investigation and team drama.











