The Rev-9 is a fictional character from the movie Terminator: Dark Fate. It is an advanced model of a Terminator, designed for infiltration and assassination. The Rev-9 features a unique ability to separate its endoskeleton from its liquid metal exterior, allowing it to operate in two forms simultaneously. In the film, the Rev-9 is sent back in time to eliminate a key target, showcasing its advanced combat skills and adaptability. This character represents the ongoing theme of artificial intelligence and the struggle between humans and machines in the Terminator franchise.