At the time of his death, Wieringo had completed seven pages of a "What If?" story featuring the temporary "replacement" Fantastic Four of Spider-Man, Wolverine, the Hulk, and the Ghost Rider that had originally been assembled in a 1990 three-part "Fantastic Four" storyline. Marvel Comics donated the script and Wieringo's art to The Hero Initiative, a charity dedicated to assisting Golden Age and Silver Age comics creators who retired without pensions or benefits and require financial assistance. Wieringo's colleagues stepped in to complete the story. The completed 48-page book, "What If?—The Fantastic Four Tribute to Mike Wieringo", features, in addition to Wieringo's art, artwork by Arthur Adams, Paul Renaud, Stuart Immonen, Cully Hamner, Alan Davis, David Williams, Sanford Greene, Humberto Ramos, Skottie Young, Mike Allred, and Barry Kitson, and was released in June 2008.