Dr. Katherine Pulaski is a fictional medical doctor in the American science fiction television series Star Trek: The Next Generation. She served a rotation as the chief medical officer aboard the Federation starship USS Enterprise-D. During her time on the ship, her medical skills saved the lives of both Captain Jean-Luc Picard and Commander William Riker. She inadvertently caused Geordi LaForge to create a hologram of Professor Moriarty that became self-aware, after a bet involving the abilities of Lt. Commander Data. Pulaski seemed averse to most new technology and preferred to avoid the transporter, but was forced to rely on it to save her own life from a genetically-modified infection. Before arriving on the Enterprise-D, she previously served on the USS Repulse. For a time in her past, she was romantically involved with William Riker's father, Kyle Riker, with whom she has maintained a friendship. Portrayed by actress Diana Muldaur, Pulaski replaced the character of Commander Beverly Crusher for the second season after Gates McFadden's contract was not renewed. Pulaski first appeared in the second season opener "The Child", and made her final appearance in "Shades of Gray". Before playing the role of Pulaski on The Next Generation, Muldaur appeared in the original Star Trek, playing different characters in the episodes "Return to Tomorrow" and "Is There in Truth No Beauty?" She later worked with series creator Gene Roddenberry on a pilot for the series Planet Earth. McFadden returned to replace Muldaur in the third season, reprising her role as Dr. Crusher for the remainder of the series. Reviewers criticized Pulaski's approach, as well as her inability to fit in with the crew. Critics noted that her transporter phobia was reminiscent of Dr. Leonard McCoy from the original Star Trek, as was her relationship with Data; Pulaski's interaction with Data raised comparisons to that of McCoy and Spock from the original Star Trek. Episodes featuring Pulaski in a leading role produced divided opinions among critics, with some describing "Unnatural Selection" as a key episode while others argued that it showed only the negative side of her role. Source: Wikipedia (en)