Sherlock Chipmunk is an episode of the ALVINNN!!! and The Chipmunks series.
Jeanette and Eleanor act as Sherlock Holmes and Watson when Theodore's teddy bear mysteriously disappears.
- Alvin Seville
- Simon Seville
- Theodore Seville
- Brittany Miller
- Jeanette Miller
- Eleanor Miller
- Dave Seville
- Miss Croner
- "Sleepless Nights" 
- This is the third time in the franchise that Sherlock Holmes has been portrayed. The first time being The Cruise from the Alvin and the Chipmunks series, and the second time being Elementary, My Dear Simon from The Chipmunks series. Both episodes including Simon and Theodore as the roles of Holmes and Watson, only this is the first time that Holmes and Watson are being portrayed by The Chipettes.
- Theodore's superhero costume, first worn in the season one episode Super Heroes, makes its first re-appearance. Talking Teddy also makes another re-appearance, in this episode.
- The fact that Theodore is seen celebrating his birthday alone would suggest that The Chipmunks are not triplets.