During his 17 years as "X-Men" writer, Claremont wrote or co-wrote many classic X-Men stories, such as "The Dark Phoenix Saga" and "Days of Future Past". Comics writers and historians Roy Thomas and Peter Sanderson observed that "'The Dark Phoenix Saga' is to Claremont and Byrne what the 'Galactus Trilogy' is to Stan Lee and Jack Kirby. It is a landmark in Marvel history, showcasing its creators' work at the height of their abilities." Comics historian Les Daniels noted that "The controversial story created a sensation and "The X-Men" became the comic book to watch." In 2010, Comics Bulletin ranked Claremont and Byrne's run on "The X-Men" second on its list of the "Top 10 1970s Marvels". Claremont and artist Frank Miller crafted a "Wolverine" limited series in 1982. With artist Walt Simonson, Claremont produced "The Uncanny X-Men and The New Teen Titans" in 1982, an intercompany crossover between the top-selling Marvel and DC titles. The New Mutants were introduced by Claremont and Bob McLeod in "Marvel Graphic Novel" #4 (Dec. 1982) and received their own ongoing series soon after. The second X-Men film was loosely based on his "X-Men" graphic novel "."