How to defeat Optimum Alfred:
     First use the Raticcator located at the rat cave in the basement.
After  you  put  the  costume on, go to the elevator and go to the Sun
Deck.  There  you  will  find Optimum Alfred when you find him use the
Raticcator's  gadgets,  then  he is going to fly away that means he is
sending  his robots, Again use the Raticcator's gadgets on his robots.
After  you  do  it  you will see Optimum Alfred again then do the same
thing over and over again. It would Probably take 3 to 5 times.