In this paper, the random bounded operators from a Banach space X into a Banach space Y and the problem of extending random operators are investigated. It is shown that unlike the deterministic bounded operators, the random version of the principle of uniform boundedness and the Banach-Steinhaus theorem do not hold for random bounded operators. In addition, a random operator can be extended to apply to all random inputs if and only if it is bounded. As a consequence, we conclude that the Ito

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... chastic integral cannot be extended in a natural fashion to all random functions with square-integrable sample paths.