Yes there is, and it was excellent.  I highly recommend youtubing it ;)

Oops.  Sorry, in the description its called a sleeve.  My bad.  Not sure where Angel came from ^6^;  It's basically like a tattoo on our arm that gives us a basic power or a different one based on the universe we're in and sometimes it won't give us anything but a new outfit or maybe some kind of clue we need to work with.