In October 2006, Phillips made a guest appearance on Boston Legal, playing the father of the boy accused of killing the wife of a judge played by DS9's Armin Shimerman. Besides series regulars William Shatner and Rene Auberjonois, Trek guest actor Ron Canada also appeared in the episode.
He played the title character of the 2003 short film Living in Walter's World, co-starring Deep Space 9 star Armin Shimerman, and played the role of "Mr. Gorn" in the short Roddenberry on Patrol. This short film, directed by and co-starring Phillips' fellow Voyager actor Tim Russ (Tuvok), offers a comedic look at how Gene Roddenberry created Star Trek and also featured Robert Beltran, Richard Herd, Walter Koenig, Nichelle Nichols, Robert O'Reilly, Robert Picardo, and George Takei.
Phillips' voice can also be heard on the Nickelodeon films The Wild Thornberrys Movie (2002, also featuring the voices of Brock Peters, Keith Szarabajka, and Alfre Woodard) and Rugrats Go Wild! (2003, also with the voice of Tony Jay). He has also lent his voice to a number of Star Wars video games