US TV
WENN
O'Donnell will play Callen, a man with the ability to quickly switch personas, while the rapper's role is that of ex-Navy SEAL Sam Hanna, a veteran of the Afghanistan and Iraq wars.
The network is still in the process of casting the four other major roles.
The new set of naval police officers will be introduced in a later NCIS episode this season, with the new untitled show launching later in the year.
CBS was encouraged to launch an NCIS spinoff after the show scored its highest ever ratings this season.
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