Ploog, on Marvel's The Monster of Frankenstein – the first five issues of which (Jan.-Oct. 1973) contained a relatively faithful adaptation of Mary Shelley's novel. As one critic wrote of issue #4: "Unmatched by anything else he'd written at Marvel, Friedrich's script ... had reached a point that perfectly captured the 19th-century cadences of Shelley's prose and lifted the strip far above any past or, so far, future attempt to adapt the character to comics." Friedrich co-created the supernatural hero the Son of Satan in Ghost Rider vol. 2, #1 (Sept. 1973). Friedrich recalled in 2009 that Marvel editor-in-chief Stan Lee "had some idea that he wanted a character called Son of Satan. I have no idea why or where it came from. All he really had was the name and he wanted us to create a character based around that. I guess it just popped in his mind. He said "I want a title called Son of Satan. Do it!" In the mid-1970s, he also wrote the majority of the seven-page Captain Britain stories in the character's namesake Marvel UK weekly comic book following the departure of original writer Chris Claremont. Other work Friedrich's work for other publishers includes writing for the Skywald line of black-and-white horror-comics magazines. For that company he created Hell-Rider – a Vietnam-vet vigilante motorcyclist with a flame-thrower-equipped bike – in a namesake two-issue series (July–Aug. to Sept.-Oct. 1971). The following year, Friedrich worked with Thomas on the similarly motorcycle-mounted Ghost Rider. Additionally, Friedrich freelanced for the short-lived Atlas/Seaboard Comics, where he wrote the crime comic Police Action #2-3 (April and June 1975) and the feature "Son of Dracula" in Fright #1 (June 1975), and scripted the sole story of the character Man-Monster, co-plotted by Tony Isabella and penciller Rich Buckler, in Tales of Evil #3 (July 1975). He also wrote the second and final issue of The Cougar, the third and final issue of Morlock 2001, with the rare art team of Steve Ditko and Bernie Wrightson; the third and final issue of The Brute; and the fourth and final issue of IronJaw (all July 1975). Later career Friedrich left comics in 1978 and returned to Missouri, where he eventually spent many years as a driver/courier in the St. Louis area. In 1993, Friedrich scripted Topps Comics' Jack Kirby-created Bombast #1 (April 1993), where he teamed once more with plotter Roy Thomas and Sgt.