Marvel Comics
Englehart's first work in comics was on a 10-page story by writer Denny O'Neil in Warren Publishing's black-and-white horror comics magazine Vampirella #10 (March 1971).[7] After briefly serving as a member of the Crusty Bunkers art team,[8] Englehart started working as a full-time writer. He began with a co-writing credit, with Gardner Fox, on the six-page, Englehart-drawn "Retribution" in Warren's Eerie #35 (Sept. 1971). Then, as Marvel editor Roy Thomas said in a 2007 interview, Englehart became "...a summer replacement or some such for [writer] Gary Friedrich. When Gary wanted to go away for a while, he got Steve, who was sort of a young aspiring artist when he came up to Neal [Adams]'s studio, and he ended up at Marvel as a proofreader. Then he wanted to write, and I believe he wrote a few pages of a sample script. Anyway, I gave him 'The Beast' [in Amazing Adventures] to try out on, and that worked out pretty well.[9]"
Englehart said he had first done uncredited co-scripting on a number of stories: "When Gary Friedrich's Sgt. Fury #94 came in, de facto editor-in-chief Roy Thomas wanted major revisions in the script and had me do them. Evidently he liked the result, because right after that, Gary turned back a job he'd been holding onto - dialoguing a little story plotted by Al Hewetson - and Roy asked me to script it from scratch. That was [the seven-page] 'Terror of the Pterodactyl' [drawn by Syd Shores, in Monsters on the Prowl #15 (Feb. 1972)] and my first credited job.... Over the next six months, even as my credited stories began to appear, I continued to do uncredited collaborations - sometimes by design and sometimes at the last minute.'[10]"
This uncredited work included Friedrich's Sgt. Fury and his Howling Commandos #97, Iron Man #45, and The Incredible Hulk vol. 2, #152, plus two romance comics stories and a Western tale.[10] Englehart then wrote two romance stories under the pseudonym Anne Spencer, in Our Love #18 (Aug. 1972) and My Love #19 (Sept. 1972), and, under his own name, a standalone supernatural story in the anthology Journey into Mystery vol. 2, #1 (Oct. 1972)[11]
During his first credited superhero work, on a series starring erstwhile X-Men member the Beast in Amazing Adventures vol. 2, #12–17 (May 1972 – March 1973), Englehart integrated the Patsy Walker character, the star of a teen romantic-comedy series, into the Marvel Universe alongside the company's superheroes.[12] He and artist Sal Buscema launched The Defenders as an ongoing series in August 1972[13][14] and introduced the Valkyrie to the team in issue #4 (Feb. 1973).[15] Englehart has stated that he added the Valkyrie to the Defenders "to provide some texture to the group."[16]
He wrote The Avengers from issue #105 (Nov. 1972) to #152 (Oct. 1976). During his time on that title, he wrote several major storylines including "The Avengers Defenders War" in issues #115–118 (Sept.–Dec. 1973), crossing over into The Defenders #8–11 (Sept.–Dec. 1973);[17] "The Celestial Madonna" in #129–135 (Nov. 1974 – May 1975) and Giant-Size Avengers #2–4 (Nov. 1974 – May 1975);[18][19][20] and "The Serpent Crown" in #141–144 (Nov. 1975 – Feb. 1976) and #147–149 (May–July 1976).[21]
In the fall of 1972, Englehart and writers Gerry Conway and Len Wein crafted a metafictional unofficial crossover spanning titles from both major comics companies. Each comic featured Englehart, Conway, and Wein, as well as Wein's first wife Glynis, interacting with Marvel or DC characters at the Rutland Halloween Parade in Rutland, Vermont. The story began in Amazing Adventures #16 (by Englehart with art by Bob Brown and Frank McLaughlin), continued in Justice League of America #103 (by Wein, Dick Dillin and Dick Giordano), and concluded in Thor #207 (by Conway and penciler John Buscema). As Englehart explained in 2010, "It certainly seemed like a radical concept and we knew that we had to be subtle (laughs) and each story had to stand on its own, but we really worked it out. It's really worthwhile to read those stories back to back to back — it didn't matter to us that one was at DC and two were at Marvel — I think it was us being creative, thinking what would be really cool to do."[22]
Englehart had a run on Doctor Strange (originally with artist Frank Brunner, later with Gene Colan), in which Strange's mentor, the Ancient One, died and Strange became the new Sorcerer Supreme. Englehart and Brunner, audaciously, also created a multi-issue storyline in which a sorcerer named Sise-Neg ("Genesis" spelled backward) goes back through history, collecting all magical energies, until he reaches the beginning of the universe, becomes all-powerful and creates it anew, leaving Strange to wonder whether this was, paradoxically, the original creation (Marvel Premiere #14). Editor-in-chief Stan Lee, seeing the issue after publication, ordered Englehart and Brunner to print a retraction saying this was not God but a god, so as to avoid offending religious readers. The writer and artist concocted a fake letter from a fictitious minister praising the story, and mailed it to Marvel from Texas; Marvel unwittingly printed the letter, and dropped the retraction order.[25] Englehart's Doctor Strange #14 featured a crossover story with The Tomb of Dracula #44, another series which was being drawn by Gene Colan at the time.[26] In Englehart's final story for the series, he sent Dr. Strange back in time to meet Benjamin Franklin.[27]
Describing that time, Englehart said in 1998, "We'd rampage around New York City. There was one night when a bunch of us, including Jim Starlin, went out on the town. We partied all day, then did some more acid, then roamed around town until dawn and saw all sorts of amazing things (most of which ended up in Master of Kung Fu, which Jim and I were doing at the time).[28]"
Englehart and artist Starlin co-created the character Shang-Chi, Master of Kung Fu,[29][30] though they only worked on the early issues of the series. Englehart reconciled the existence of Captain America and sidekick Bucky in Marvel's 1950s precursor, Atlas Comics, an anomaly that had been ignored since Captain America's 1964 reintroduction to Marvel presented him as having been in suspended animation since 1945. Englehart's newly retconned history stated that the 1950s Captain America and Bucky had been different characters from the ones who had debuted in the 1940s.[31][32][33] This was followed by an extended storyline of Steve Rogers becoming so profoundly disillusioned with the United States[34]
In March 1976,[40] Englehart had a falling-out with Marvel and left the company.