Sunder, a retriever of rare objects, comes to collect the Omnitrix but winds up sending Ben to the Null Void dimension without the Omnitrix or his left hand. As the separated hand fights to avoid Sunder's capture while seeking Julie, Gwen and Kevin for help, Ben fights for his life against ravenous monsters, "single-handedly."
Did You Know?
No explanation given as to how Ben's hand moves about with independence of thought and perception. One can only assume the Omnitrix is able to see and guide the hand. See more
My hand is in the Null Void?
How do we get it back?
Simple. All we have to do is reverse the polarity of the thing that displaced it in the first place.
I said it was simple, not easy.