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SED - Need help removing characyers from filenames

I have hundreds of .zip N64 games. I want to remove certain characters from the filenames, but I'm terrible wihth SED and regular expressions. The files look like this:

Paperboy (U) [!].zip
Paper Mario (U) [!].zip
Penny Racers (U) [!].zip
Perfect Dark (U) (V1.1) [!].zip
PGAeurotour.zip
Pilotwings64.zip
Pokemon Puzzle League (U) [!].zip
Pokemon Snap Station (U) [!].zip
Pokemon Snap (U) [!].zip
Pokemon Stadium 2 (U) [!].zip
Pokemon Stadium (U) (V1.1) [!].zip
Polaris SnoCross (U) [!].zip
Powerpuff Girls, The - Chemical X-Traction (U) [!].zip
Power Rangers - Lightspeed Rescue (U) [!].zip
Premier Manager 64 (E) [!].zip

I want to remove every instance of these characters from every filename, and remove the spaces.

(U) [!] (E) (V1.1)

Any help would be appreciated.

Code:

for file in * ; do      # will act on all files in the working dir

    temp=${file%%(*}        #get everthing up to the first "("

    temp2=${temp//' '/_}    # translate spaces to "_"  ; adjust to youre needs

    mv "$file" "${temp2}.zip"    # and rename the file

done

It does not test, whether it is a ".zip"
It only assumes this.

Easy enough to insure .zip by adding to the wildcard in the for loop:

Code:

for file in *.zip ; do

Also, no need for the quotes around the space in the underscore translation.

As a precaution to test the script, simply place an echo prior to mv and you will see a print out of what will happen once removed :)