Oh, what a happy little question! There were three actors who appeared in both Bonanza and the original Star Trek series. It's like our little world is full of hidden connections just waiting to be discovered. Just like when you're painting, sometimes the most beautiful things come from unexpected places.
Little Joe Cartwright in Bonanza, was one role he starred in.
She played Emily Pennington in the 1959 episode "The Newcomers".
Joan Collins was in "The City on the Edge of Forever". I don't know of anyone else.
I was unable to find Robert (Bob) Carter on the guest star list of the series.
The Saddle Stiff, #406, originally aired on January 16, 1972, season 13. Guest star Buddy Ebson.
Bonanza - 1959 Dark Star 1-31 was released on: USA: 23 April 1960
Bonanza - 1959 Star Crossed 9-23 was released on: USA: 10 March 1968
I could find no Bob Carter on the guest star list of the series Bonanza.
tuvok^^^Incorrect. Tuvok never appeared in the original series.The answer is Sulu, who was a regular character in the original series, and appeared on Voyager in the episode "Flashback."
The cast of The Star - 2010 includes: Mark Cray as The Star Kendra Star as Friend
The cast of Kira Star - 2010 includes: Kira Star as Her selfe
The cast of Star Baby - 2012 includes: Mallory June as Star Baby
The original Spock. Leonard Nimoy.
The cast of Five Star - 2002 includes: Prasana Kanika
The cast of My Mother Was a Star - 1979 includes: Isabel Mendelsohn
The cast of Super Star - 2011 includes: Atsuko Sakurai
The cast of Star Love - 2010 includes: Javier Botet