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;
Sarek (Star Trek: The Next Generation) wife for Sarek. Perrin was played by Joanna Miles in her first "Star Trek" appearance. Both Miles and Lenard would return in the same roles for the first part of the episode "". The writers and producers were nervous about mentioning Spock in "Sarek", with an early version of the script only calling for a reference by Picard to Sarek's son's wedding. The third season had seen a relaxation in Roddenberry's previous direction that "The Next Generation" could not touch on aspects of "The Original Series". This was especially seen at the end of "Sarek", in which Picard mentions Spock