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 including some soft reboot elements with an all new cast. Some episodes connected to "TNG" directly including guest stars by Brent Spiner and connections to the events in "TNG"'s fictional universe. The three-episode story arc consisting of "", "Cold Station 12", and "The Augments", with a Soong ancestor portrayed by "The Next Generation" regular Brent Spiner provides some backstory to Data's origins. Also, the "Enterprise" episode "" also helps explain the smooth-headed Klingons that sometimes appeared, a retcon that helped explain this varying presentation between "TOS", "TNG", and the films. "Star Trek" would not return to television as a show