Richard Green

Acting ensign Richard Green is a human male who serves as a helmsman on board the USS Valentine. He is the son of Valentine chief medical officer Amy Green. (Star Trek: The New Adventures)

Background information
Richard Green was played by actor David McPaul.

The reason why he wasn't seen in the first season was because he was supposed to be in the first season but was replaced by Jackson Thompson which was Sarah Thompson's son.

According to the script, Green accidentally stumbled upon the bridge when he noticed the conn officer was killed so he asked to take her place. He also performed a maneuver which narrowly avoids an oncoming ship.

McPaul described this as a good acting job and he is glad that he will finally get a main cast role.