Published by Wizards of the Coast.
1985’s Isle of the Ape is the last official D&D module by Gary Gygax published by TSR. That alone makes it fairly significant. Like its predecessor in the WG series, Mordenkainen’s Fantastic Adventure, this module is, at least in part, a throwback to the early days of the hobby, since the eponymous Isle was a feature of Gary’s own (still-unpublished at that time) Castle Greyhawk. Though I have no firsthand knowledge to substantiate this supposition, I believe that these late Gygax modules were to some degree a reaction to the Hickman Revolution. I base my feelings on contemporary articles by Gary in Dragon, in which he makes the case that D&D had become too focused on “story” and that there was a need to “start pushing the pendulum the other way” back toward “action, rather than role playing, … [as] the major focus of gaming.” (Issue 102) Isle of the Ape has only the thinnest plot, being mostly a romp through an extremely deadly version of King Kong’s Skull Island, re-imagined as a demiplane, so, if I’m wrong in this supposition, I don’t do so without cause.
Read the Full Retrospective/Review at Grognardia.