Unlike his mustache ... Alex Trebek has finally returned to the set of "Jeopardy."
Trebek -- who was sidelined with a mild heart attack last month -- arrived to the set at Sony Pictures Studios this morning ... sporting a big 'ol Canadian smile.
We're told 72-year-old Trebek is in "good health" ... in fact, a rep for the show tells us he's already planning to start a couple of new home improvement projects.
As we previously reported, Trebek spent a couple of days at Cedars-Sinai Medical Center in L.A. after suffering the heart attack on June 23.
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