I could be wrong, but I think Mork turned out to be a dream in the HAPPY DAYS episode.
**EDIT**
This was on the episode's IMDB page - When originally aired, events of the story were revealed to be all a dream of Richie's. When Mork & Mindy (1978) was first picked up as a regular series, a new ending was filmed for subsequent airings. The alternate ending revealed that Mork cast a spell to erase anyone's memory of him on Earth, while fixing Richie's memory to believe everything had been a dream.
So, it was originally a dream, but when it was a big hit with fans and the TV execs they rewrote and refilmed the ending to be a prequel for the new series.
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