Full Idea
The Theory of Worldbound Individuals contends that no object exists in more than one possible world; this implies the outrageous view that - taking properties in the broadest sense - no object could have lacked any property that it in fact has.
Gist of Idea
If individuals can only exist in one world, then they can never lack any of their properties
Source
Alvin Plantinga (Transworld Identity or worldbound Individuals? [1973], II)
Book Reference
'The Possible and the Actual', ed/tr. Loux,Michael J. [Cornell 1979], p.157
A Reaction
Leibniz is the best known exponent of this 'outrageous view', though Plantinga shows that Lewis may be seen in the same light, since only counterparts are found in possible worlds, not the real thing. The Theory does seem wrong.