The pair play agents sent to find the funnyman and bring him back to America and, with the help of British tough guy Vinnie Jones and Robin Williams, they head off to remote Mongolia.
In a cave, Duhamel asks of the white-haired man before him, "Are you the one they call The Host?" The reply: "No one has called me that in years... You're wasting your time."
Fox then opens a case with an Oscar statuette inside, adding, "We come to you on behalf of our friend..."
Crystal then turns round and quips, "You could have just texted."
The funnyman signed up to return as Oscars host after Eddie Murphy pulled out a day after his friend Brett Ratner resigned as producer of the 84th Academy Awards in November (11).