Cali89Honda

I was replacing the spark plugs in a 1989 accord, something I've done
many times on many different vehicles. It's never been a problem until
this instance. When I used the socket to loosen Plug #1, it eventually
loosened but didnt screw out with ease. The other plugs 2-4 came out
with ease and I installed new plugs in them, however everytime I
attempted to install the new plug in the first plug hole I couldnt get
it to screw in. It just wouldnt catch. I then used a light and have
determined that the threads on this first spark plug hole were cross
threaded last time the plugs were changed (by a mechanic) I also
noticed on the block around this spark plug hole its kinda black and
the other 3 spark holes arent black on the metal outside their hole.
Has anyone ever ran into this situation and if so how did you solve the
problem. Someone I work with suggested I get a 14mm thread chaser and I
tried that and it wont catch either... cant repair any of the threads
if it wont screw in. Any help or comments would be appreciated.