Crusher assured Picard she had signed on the Enterprise-D voluntarily and not due to Picard's influence. He was killed in action at the age of 32, for which Picard blamed himself until Beverly Crusher first reported on the USS Enterprise. Dead before the series' beginning, Crusher is the late husband to Beverly Crusher and father of Wesley Crusher, and former second officer (third in command) aboard the USS Stargazer, Jean-Luc Picard's first command. Crusher was portrayed by actor Doug Wert. Reginald Barclay - 5 (also in First Contact and Voyager).Alexander (Worf's son) - 8 (also in DS9).Alyssa Ogawa - 16 (also in Generations and First Contact).Guinan - 29 (also in Generations and Nemesis).Number of episodes (approximate) (examples) Two well-known people that had roles on Star Trek were the NASA astronaut Mae Jemison and astrophysicist Stephen Hawking.
Pulaski was given the credit line "special appearance by" for her Season 2 shows, also fewer than that of O'Brien. In particular, Tasha Yar was in 28 episodes, fewer than the recurring characters Guinan and O'Brien. The line between regular cast, recurring character, and a guest star is sometimes a grey area on TNG. Ro Laren is an example of a recurring character that was introduced on TNG, but did not make the leap to DS9. Main article: List of Star Trek: The Next Generation cast members Enterprise-D Characters summary (examples)