Hi Strake!
There is an enormous bunch of bad 70s-movies answering your question, where stewardesses or passengers (usually the Patrick Swayze-type of guy) grab the controls from the just-murdered pilots. Also there is a movie where they pump 10.000 gallons of water from another aircraft in mid-air into the avionics bay to lower the nose of an out of trim-aircraft. And did you see the one where a new pilot is lowered from a helicopter through the because-of-a-hit-with-a-cessna-now-broken window to land the 747?
If you have 500hrs SEP, you know how to operate a radio... scream for help on the freq that is dialed, or choose 121.5, and scream for help there; and hopefully the autoland works :-)
Cheers,
P77