There is a very early segment of Legion's Quest in which Legion ends up in Undocumented Features, but it was written without knowledge of the EPU folks, and because they maintain a more or less closed universe it is not considered in any way official and is in fact the subject of some annoyance to them. However, several things that are important to every subsequent LQ story -- his ship and Min to name two -- come from that story, so it can't just be dustbinned and forgotten. Hence, it is a world very very very much like UF but not at all UF in any official way.
-- Bob
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Then the horns kicked in...
...and my shoes began to squeak.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.