The Titans made its debut in October '75 (Marvel U.K.'s 5th superhero title) and was notable for its use of a "landscape" orientation. Although this format allowed two pages of Marvel U.S. artwork to fit onto one (magazine-sized) Marvel U.K. page, reader reaction was mixed, as it made the text small and often difficult to read. The Titans featured well-known characters like Captain America, Captain Marvel, the Sub-Mariner, the Inhumans, and Nick Fury, Agent of S.H.I.E.L.D.
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The Titans #1, 25th Oct 1975. Published by Marvel Comics Group for the U.K. Included a poster.
The Titans #2, 1st November 1975. Published by Marvel Comics Group for the U.K.
The Titans #3, 8th November 1975. Published by Marvel Comics Group for the U.K.
The Titans #4, 15th November 1975. Published by Marvel Comics Group for the U.K.
The Titans #5, 22nd November 1975. Published by Marvel Comics Group for the U.K.
The Titans #6, 29th November 1975. Published by Marvel Comics Group for the U.K.
The Titans #7, 6th December 1975. Published by Marvel Comics Group for the U.K.
The Titans #8, 13th December 1975. Published by Marvel Comics Group for the U.K.
The Titans #9, 20th December 1975. Published by Marvel Comics Group for the U.K.
The Titans #10, 27th December 1975. Published by Marvel Comics Group for the U.K.
The Titans #11, 3rd January 1976. Published by Marvel Comics Group for the U.K.
The Titans #12, 10th January 1976. Published by Marvel Comics Group for the U.K.
The Titans #13, 17th January 1975. Published by Marvel Comics Group for the U.K.
The Titans #14, 24th January 1975. Published by Marvel Comics Group for the U.K.
The Titans #15, 31st January 1975. Published by Marvel Comics Group for the U.K.
The Titans #16, 7th February 1976. Published by Marvel Comics Group for the U.K. Mistakenly dated 7th February 1975 on the Cover.
The Titans #17, 14th February 1976. Published by Marvel Comics Group for the U.K.
The Titans #18, 21st February 1976. Published by Marvel Comics Group for the U.K.
The Titans #19, 28th February 1976. Published by Marvel Comics Group for the U.K.
The Titans #20, 6th March 1976. Published by Marvel Comics Group for the U.K.
The Titans #21, 13th March 1976. Published by Marvel Comics Group for the U.K.
The Titans #22, 20th March 1976. Published by Marvel Comics Group for the U.K.
The Titans #23, 27th March 1976. Published by Marvel Comics Group for the U.K.
The Titans #24, 3rd April 1976. Published by Marvel Comics Group for the U.K.
The Titans #25, 10th April 1976. Published by Marvel Comics Group for the U.K.
The Titans #26, 17th April 1976. Published by Marvel Comics Group for the U.K.
The Titans #27, 24th April 1976. Published by Marvel Comics Group for the U.K.
The Titans #28, 1st May 1976. Published by Marvel Comics Group for the U.K.
The Titans #29, 8th May 1976. Published by Marvel Comics Group for the U.K.
The Titans #30, 15th May 1976. Published by Marvel Comics Group for the U.K.
The Titans #31, 22nd May 1976. Published by Marvel Comics Group for the U.K.
The Titans #32, 29th May 1976. Published by Marvel Comics Group for the U.K.
The Titans #33, 5th June 1976. Published by Marvel Comics Group for the U.K.
The Titans #34, 9th June 1976. Published by Marvel Comics Group for the U.K.
The Titans #35, 16th June 1976. Published by Marvel Comics Group for the U.K.
The Titans #36, 23rd June 1976. Published by Marvel Comics Group for the U.K.
The Titans #37, 30th June 1976. Published by Marvel Comics Group for the U.K.
The Titans #38, 7th July 1976. Published by Marvel Comics Group for the U.K.
The Titans #39, 14th July 1976. Published by Marvel Comics Group for the U.K.
The Titans #40, 21st July 1976. Published by Marvel Comics Group for the U.K.
The Titans #41, 28th July 1976. Published by Marvel Comics Group for the U.K.
The Titans #42, 4th August 1976. Published by Marvel Comics Group for the U.K.
The Titans #43, 11th August 1976. Published by Marvel Comics Group for the U.K.
The Titans #44, 18th August 1976. Published by Marvel Comics Group for the U.K.
The Titans #45, 25th August 1976. Published by Marvel Comics Group for the U.K.
The Titans #46, 1st September 1976. Published by Marvel Comics Group for the U.K.
The Titans #47, 8th September 1976. Published by Marvel Comics Group for the U.K.
The Titans #48, 15th September 1976. Published by Marvel Comics Group for the U.K.
The Titans #49, 22nd September 1976. Published by Marvel Comics Group for the U.K.
The Titans #50, 29th September 1976. Published by Marvel Comics Group for the U.K.
The Titans #51, 6th October 1976. Published by Marvel Comics Group for the U.K.
The Titans #52, 13th October 1976. Published by Marvel Comics Group for the U.K.
The Titans #53, 20th October 1976. Published by Marvel Comics Group for the U.K.
The Titans #54, 27h October 1976. Published by Marvel Comics Group for the U.K.
The Titans #55, 3rd November 1976. Published by Marvel Comics Group for the U.K.
The Titans #56, 10th November 1976. Published by Marvel Comics Group for the U.K.
The Titans #57, 17th November 1976. Published by Marvel Comics Group for the U.K.
The Titans #58, 24th November 1976. Published by Marvel Comics Group for the U.K. Final issue.
Titans #1, 2nd Series.
Titans #2, 2nd Series. Cover based on Tales of Suspense #63.
Titans #3, 2nd Series. Cover based on Tales of Suspense #66.
Titans #4, 2nd Series. Cover based on Tales of Suspense #68.
Titans #5, 2nd Series. Cover based on Tales of Suspense #70.
Titans #6, 2nd Series.
Titans #7, 2nd Series. Cover based on Tales of Suspense #50.
Titans #8, 2nd Series.
Titans #9, 2nd Series. Cover based on Tales of Suspense #74.
Titans #10, 2nd Series. Cover based on Tales of Suspense #75.
Titans #11, 2nd Series. Cover based on Tales of Suspense #77.
Titans #12, 2nd Series. Cover based on Tales of Suspense #79.
Titans #13, 2nd Series. Cover based on Tales of Suspense #80.
In March '80, as part of the "Marvel Revolution", Dez Skinn launched the Marvel Pocket Books line with four 52-page titles. The line began with Spider-Man, the Fantastic Four, Star Heroes (featuring TV tie-in Battlestar Galactica and the toy-based strip the Micronauts continued from their previous run in Star Wars Weekly), and Chiller (starring Dracula and the Man-Thing with occasional appearance from other horror-related characters). Following Skinn's belief that much of Marvel's strongest material was that published in the '60s and early '70s, many of these titles showcased strips from that period.

Skinn drew on the design of the traditional UK Picture Library titles which boomed in the '60s to establish a definitive look for the Pocket Books. Skinn wrote that they "emulated the look in their Combat Picture Library covers ... that was the look I wanted, to pull the line of pocket books together visually and make them different to any of our other titles ...".

The first four titles were later joined by Hulk, The Titans (reprinting the '60s stories of Captain America, Thor and Iron Man), Marvel Classics Comics (featuring comic book adaptations of classic literature), Conan, and Young Romance. Some titles were not a success in terms of sales: Hulk, Conan, The Titans, Marvel Classics Comics, and Young Romance were cancelled after 13 issues, while Star Heroes (which had replaced The Micronauts with the original X-Men from issue #10) was re-launched as X-Men Pocket Book from #14. All other Pocket Books were cancelled after issue 28 in July/August '82.

Classic Marvel material was by no means completely abandoned after the demise of the Pocket Books. The Hulk strips continued in a newly launched The Incredible Hulk Weekly and similarly the classic Fantastic Four strips resurfaced in a weekly title in October '82. Both of these eventually folded into Spider-Man Comics Weekly, where the strips continued on and off until it changed into The Spider-Man Comic, aimed at younger readers. The classic Spider-Man material continued in the first few issues of The Daredevils.
Not every back cover had something great on them (usually adverts for breakfast cereals or plastic model kits), but here's four covers that were well-worth scanning ..
Back cover of The Titans #43.
Back cover of The Titans #44.
Back cover of The Titans #48.
Back cover of The Titans #51.