The Sun reports that Watson will be furious when his friend returns to his side for the third series, following his apparent death in the finale of the second.
Holmes, played so assuredly by Benedict Cumberbatch, appeared to be fatally outsmarted by his nemesis Moriarty, and had to jump from the top of a London building, to avoid communal doom for many others.
Holmes' return follows the original Conan Doyle narrative, where the peerless detective reappeared after plunging into the Eisenbach Falls, again with Moriarty in the mix. But the books showed Dr Watson's reaction to his friends re-arrival to be a dead faint.
According to The Sun, Gatiss thinks this is "unlikely - as opposed to possibly a stream of terrible swear words".
Gatiss also plays Holmes brother Mycroft in the series, which has proved an enduring hit since its contemporary inception two years ago, and has made tons of cash for the BBC with worldwide sales, as well as igniting fresh interest in the books.
Holmes and Watson in action...