Gex 3: Deep Cover Gecko is a platform video game. It is the third and final installment of the Gex video game series.

While watching television, Gex discovers that his partner and lover, Agent Xtra, now the head of the "TV Terrorist Defense Unit", has been reported missing. Xtra herself manages to contact Gex and inform him that Rez has returned once again and kidnapped her to get to him. Through his secret lair, Gex returns to the Media Dimension and circumnavigates numerous television channels with help from his butler, Alfred, and in the process frees and befriends Rez's prisoners, Rex and Cuz. Together, they find Rez and challenge him to a final battle. In the aftermath, Rez is destroyed once and for all, and Gex saves Xtra. In the PlayStation version's ending, as Xtra tells Gex of her time in the Media Dimension, Alfred attempts to warn Gex of a world emergency, but is ignored. The game ends with Gex and Xtra making love.