Exclusive

Elementary Sneak Peek: Sherlock and Owain Yeoman's Scientist Swap Jabs

To solve their latest case, Elementary‘s Sherlock and Joan will enlist the help of his boarding-school classmate (played by The Mentalist‘s Owain Yeoman) — that is, if the two men can get over their distaste of each other.

In this exclusive sneak peek at Sunday’s milestone 100th episode (CBS, 10/9c), Sherlock’s old acquaintance resurfaces as a colorfully-attired scientist with a penchant for playfully insulting the P.I.

“If it weren’t for me, our friend Sherlock would still think that the sun revolves around the Earth,” Yeoman’s character teases.

“I was eight when I made that mistake,” Sherlock responds. “You chose to wear that vest this morning.” Burn!

But with a dead body on his hands, the investigator needs to play nice with his frenemy in order to determine who murdered “a man who was looking for better and more efficient ways to identify what are known as Earth-killer asteroids,” executive producer Rob Doherty previously told TVLine. “There’s mystery on top of mystery as to why anyone would want to kill someone who might be able to help NASA locate and, hopefully, divert a small planetoid hurdling towards Earth.”

Thankfully, the scientist is able to offer some insight by explaining asteroid research to Sherlock — “in layman’s terms, of course,” he adds.

Press PLAY above to watch the sneak peek, then hit the comments with your thoughts on Yeoman’s cheeky role.