David Berry has been cast as Lord John Grey in “Outlander” Season 3. Author Diana Gabaldon, on whose books the show is based, made a few brief comments about the casting and also explained the proper way use the title of the character. Meanwhile, cast members Sam Heughan, Grant O’Rourke and Steven Cree had a hilarious conversation with William Shatner online.

“Hooray!” Gabaldon wrote on her Facebook page about the highly anticipated casting of Lord John Grey. She said that she hasn’t seen Berry act, but also added that the producers of the show have so far not gone wrong with the casting.

The author also took the opportunity to point out the right way to use the title of the character. Since the character is a part of the British aristocracy there are a few simple rules that need to be followed. As the second son of a Duke, the character has to addressed as “Lord” and not “Sir.”

In addition to that it is always Lord John Grey or Lord John. The rule is to use the first name after Lord or the first name and last name after Lord. The last name alone can’t be used. So, it can never be “Lord Grey.”

Lord John Grey is an important character and will be seen as the Governor of Ardsmuir Prison in “Outlander” Season 3. One of the prisoners there is Jamie Fraser (Sam Heughan), and he will form an uneasy friendship with the new character.

Meanwhile, some of cast members had a very funny chat with William Shantner on Twitter. The conversation posted on Outlander BTS, shows how Shatner forgot to mention Grant O’Rourke (Rupert MacKenzie) while talking about an event that was held recently. O’Rourke pointed out that he was also a participant, with a “cough.”

“Another Mackenzie? How many are there,” Shatner asked. One of the fans told the “Star Trek” actor that Cree (Ian Murray) was also present at the event.

In the end Gabaldon was roped into the conversation and Shatner was shown the family tree of the “Outlander” series. That was of little help, as Shatner had more questions he wanted answered.