Mister Laff was a criminal who got the idea of twisting practical jokes into profitable crimes. His modus operandi was discovered by Mr. Terrific, who remembered a page from an old joke catalog with his amazing memory, and turned it against Mister Laff.
- Enemy of Mister Terrific
- This version of Mister Laff, including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.
- 1 Appearances of Mister Laff (Earth-Two)
- 1 Images featuring Mister Laff (Earth-Two)
- Quotations by or about Mister Laff (Earth-Two)
- Character Gallery: Mister Laff (Earth-Two)