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." Written by
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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
Now, hand over the Omnitrix or I slice the girl in two.