Alien Opponent (2010)

When an alien ship crashes in a junkyard shortly after the murder of the owner, his wife and his mother-in-law (who killed him) decide to pin the killing on the alien.  Then they realize they can't collect their big inheritance without a body, which is in the junkyard with the alien.

They go on tv to offer a $100,000 reward to whoever can retrieve the body and kill the alien.  Tons of idiots show up the next day in hopes of getting rich quick.  The alien does not take kindly to a mass of idiots trying to kill him as he just wants to be left alone to  repair his ship.

There are a few characters that are briefly introduced to us before the carnage starts, but mostly it's just people streaming in and out of the story line.  The most enjoyable one is Roddy Piper who  plays a priest that teams up with a couple other reward seekers.

There are some funny moments in the film, and the requisite back stabbers who manipulate, start rumors, and cause general distrust among the competitors to ensure that will be the ones to get the money.