How Do I Cause An Actor To Disappear After Overlapping Another Actor??

Hi All,
I'd like to know how i can make one smaller size actor disappear when it COMPLETELY overlaps or come inside the boundaries of another larger actor.
Thanks in advance.
Marcus
I'd like to know how i can make one smaller size actor disappear when it COMPLETELY overlaps or come inside the boundaries of another larger actor.
Thanks in advance.

Marcus
Comments
One more inquiry?
How about the overlapping actor being destroyed at the completion of an animation cycle on the last frame of the animation; like a ship actor entering a space gate when it is only fully opened as an example?
Thanks once again.