Is there a way to say something like $NewVariable eq whatever $ExistingVariable would be if I applied s/^Super// to it?

But of course

my $str1 = "SuperMan";
print $str1, $/;

(my $str2 = $str1) =~ s{^Super}();
print $str2, $/;

__output__

SuperMan
Man
[download]

HTH

_________
broquaint