Season 9 Episode 2 of "Murdoch Mysteries" is titled "Mark Twain". It will see the beloved author seeking help from Murdoch and his associates after he starts receiving death threats.

The role of the American writer will be essayed by William Shatner, and although he doesn't resemble Twain, the actor said he was happy to play his version of the author.

"Twain was tall and slim with white hair, at least when he got older, so I am playing my version of it," the actor told CBC. However, he is not a fan of the moustache that Twain sported.

"I stay away from moustaches because they're irritating," Shatner told The Star. "They make you short-tempered. They're prickly. It gives me no insight at all into why somebody would wear facial hair."

The official synopsis of the episode reads:

At a Toronto speaking engagement the celebrated author and humorist Mark Twain makes some controversial comments which lead to threats made against him. Murdoch and the Constabulary must protect the most famous American of the late 19th century.

The Season 9 premiere episode of "Murdoch Mysteries" saw George Crabtree still behind bars for the murder of his lover's abusive husband, while Murdoch investigates the stabbing of an inmate that could be connected to the murder.

Despite many assuming correctly that Crabtree wasn't involved in the murder of Archibald Brooks, there was no concrete evidence to prove his innocence. But that problem was solved in "Nolo Contendere," where it was shown that Simon was the one who actually shot Archie, and that he and Edna escaped Toronto soon after.

"Murdoch Mysteries" is aired Mondays at 8pm on CBC.