William Thomas "Will" Riker is a fictional character in the Star Trek universe appearing primarily as a main character in Star Trek: The Next Generation, portrayed by Jonathan Frakes. Throughout the series and its accompanying films, he is the Enterprise's first officer, and briefly captain, until he accepts command of the USS Titan at the end of Star Trek: Nemesis. He is the husband of Deanna Troi. The adventures of the USS Titan, which Riker captains, are told in the Star Trek: Titan novel series and other Star Trek media.