|Season(s)||1, 2, 3, 4|
|First seen||The Red Team|
|Last seen||Murder Ex Machina|
|Residence||The Brownstone, Brooklyn, New York City, New York, U.S.; Joan's Apartment, Brooklyn, New York City, New York, U.S.|
|Other relatives||Len Pontecorvo (former owner)|
Clyde is Sherlock Holmes' Horsfield tortoise.
Clyde is a tortoise previously owned by Len Pontecorvo. Sherlock Holmes and Len both visited the same conspiracy theory forums, so when no one had heard from Len, Sherlock decides to visit his house where he finds him dead. While Sherlock is looking for evidence, he finds Clyde and brings him home with him. From his sarcastic comments that tortoises make an excellent soup, Joan Watson initially thinks Sherlock intends to fatten and eat Clyde, but by the end of the episode it becomes clear that Sherlock is in fact fond of Clyde and never intended to harm him; he loves tortoises, remarking that "Clyde will likely outlive both of us."
Clyde is occasionally seen around the brownstone. He usually resides in a terrarium, but is often being used by Sherlock as either a prop in a crime-scene model or as a paperweight. He is immensely fond of lettuce and other greens, which are fed to him by Watson and Holmes.
|Season one appearances|
|Pilot||While You Were Sleeping||Child Predator||Rat Race|
|Lesser Evils||Flight Risk||One Way to Get Off||The Long Fuse|
|You Do It to Yourself||The Leviathan||Dirty Laundry||M.|
|The Red Team||The Deductionist||A Giant Gun, Filled with Drugs||Details|
|Possibility Two||Déjà Vu All Over Again||Snow Angels||Dead Man's Switch|
|A Landmark Story||Risk Management||The Woman||Heroine|
|Season two appearances|
|Step Nine||Solve for X||We Are Everyone||Poison Pen|
|Ancient History||An Unnatural Arrangement||The Marchioness||Blood Is Thicker|
|On the Line||Tremors||Internal Audit||The Diabolical Kind|
|All in the Family||Dead Clade Walking||Corpse de Ballet||The One Percent Solution|
|Ears to You||The Hound Of Cancer Cells||The Many Mouths of Aaron Colville||No Lack of Void|
|The Man With the Twisted Lip||Paint It Black||Art in the Blood||The Grand Experiment|
Every photo of Clyde on this wiki can be seen here.