Not All Dogs Go to Heaven "American Dad!" character, Avery Bullock in "Lois Kills Stewie" (season 6, episode 5), and his "Star Trek: The Next Generation" character Captain Jean-Luc Picard in "Peter's Got Woods" (season 4, episode 11); Jonathan Frakes, Michael Dorn and Marina Sirtis also appeared in "Peter's Got Woods" as their respective "Star Trek: The Next Generation" characters William Riker, Worf, and Counsellor Deanna Troi. "Not All Dogs Go to Heaven" features the entire original cast of "Star Trek: The Next Generation": Stewart as Captain Picard; Frakes as Riker; Gates McFadden as Doctor Beverly Crusher; Brent Spiner as Lieutenant Commander Data; Dorn as Worf;
Descent (Star Trek: The Next Generation) of the set of "Star Trek: The Next Generation", which included an opportunity by Hawking to sit in the captain's chair. Freedman told the show's executive producer, Rick Berman, that Hawking would appear on the show if asked. Hawking accepted the ensuing offer, marking the first time a guest star played himself on an episode of any "Star Trek" series. After he was sent the script, he made some modifications to it, including improving a humorous line of dialogue to make it funnier, which Berman called "delightful". Later, when actor Brent Spiner, who appeared in the scene with Hawking, first