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;
Star Trek: The Next Generation unknown actors would be more profitable than paying the films' actors' large salaries. Roddenberry initially declined to be involved, but came on board as creator after being unhappy with early conceptual work. "Star Trek: The Next Generation" was announced on October 10, 1986, and its cast in May 1987. Paramount executive Rick Berman was assigned to the series at Roddenberry's request. Roddenberry hired a number of "Star Trek" veterans, including Bob Justman, D. C. Fontana, Eddie Milkis and David Gerrold. Early proposals for the series included one in which some of the original series cast might appear as "elder statesmen",