Alex Trebek Returns to 'Jeopardy' -- Suck It Heart Attack!

7/24/2012 1:40 PM PDT

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.