Laurence Luckinbill portrayed Spock's half-brother Sybok in "Star Trek V: The Final Frontier".
Luckinbill is married to Lucie Arnaz, making him the son-in-law of Lucille Ball and Desi Arnaz, whose production company, Desilu Productions, financed the original Star Trek series.
In 1977 Luckinbill was nominated for a Tony Award as Best Actor (Featured Role - Play) for a Broadway production of "The Shadow Box." More recently he performed in the Broadway revival of "Cabaret."
In 2004 he wrote a one-man play called "Hemingway" about legendary author Ernest Hemingway, and performed the title role in an off-Broadway production in New York.
Luckinbill's list of movie credits includes "Cocktail," and has been a frequent guest star on TV shows such as City of Angels, Barnaby Jones and Murder, She Wrote. In 1985 he was the narrator of the 13-hour miniseries "Space."
He has three children with his current wife, and two sons from a previous marriage with actress Robin Strasser.
Biographical information courtesy of IMDB.com and IBDB.com.