Clearly Peter Mitchell found the right man for the job. Back in March, Murdoch Mysteries‘ showrunner teased what was to come in Season 9 of the period piece Canadian drama, saying “I’m hoping—if we can find the right guy—Mark Twain will come to town.”

That person was found—and revealed by lead actor and producer Yannick Bisson on Tuesday afternoon—when Bisson tweeted out the following image:

Earlier in the day, Bisson posted an image of the day’s call sheet, revealing Shatner would be portraying the American author, best-known for penning The Adventures of Tom Sawyer and Adventures of Huckleberry Finn.

According to a press release sent out by Shaftesbury, the show’s production company, “when Twain stirs up controversy during a speaking engagement in 1903 Toronto, Detective Murdoch and his colleagues must protect the esteemed writer.” The storyline is featured in Episode 2, “Marked Twain.”

Murdoch Mysteries is the latest Canadian series to feature Shatner as a guest star; he completed filming four episodes of Showcase’s sci-fi series Haven last year.

Shaftesbury teases Season 9 with more info:

“From within the walls of a maximum-security prison to the outer atmosphere of the earth, Season 9 of MURDOCH MYSTERIES explores new worlds and mystifying cases. 1903 begins with Detective Murdoch (Yannick Bisson), Dr. Julia Ogden (Hélène Joy), Inspector Brackenreid (Thomas Craig) and Dr. Emily Grace (Georgina Reilly) still reeling over the arrest of Constable George Crabtree (Jonny Harris). Then a shocking death brings great change to the world of Station No. 4. Through it all, Murdoch and team continue to solve the unsolvable, coming face to face with everything from an impossible bank robbery to a threat to destroy Canada, confronting each case with wit, wisdom and innovation.”