Episodes often feature guest voices from a wide range of professions, including actors, athletes, authors, bands, musicians, and scientists. Many guest voices star as themselves. Leslie Uggams was the first to appear as herself, in the fourth episode of the first season, "Mind Over Murder". The episode "Not All Dogs Go to Heaven" guest starred the entire cast of "", including Patrick Stewart, Jonathan Frakes, Brent Spiner, LeVar Burton, Gates McFadden, Michael Dorn, Wil Wheaton, Marina Sirtis, and even Denise Crosby (season 1 as Tasha Yar), playing themselves; this is the episode with the most guest stars of the seventh season.