In a special episode, Karl talks to actor Tim Marriott and writer Bert Coules about their one-man play Watson: The Final Problem. The show features Tim as Watson reminiscing about his apparently late friend from their first meeting up until Holmes fatal encounter with Professor Moriarty at the Reichenbach Falls. Tim and Bert discuss the initial idea for the play and how it was brought to life on stage.

Karl is relatively normal in his hero's presence.

Relatively.