Isaac Cheung

Richard is distracted while trying to finish his demonstration, Jared worries that Monica is trying to replace him, Dinesh develops a crush and Erlich's past threatens the company's chances.

When Garcia experiences anxiety over a case personal to her from her past, former BAU member Derek Morgan visits to lend emotional support.

The team joins forces with the State Department after an arms dealer's death is linked to a slew of crimes that seem to be carried out by someone with elite special forces training.

Lydia Adams and Ruben Robinson track a killer who cooked his victim's body. Meanwhile, John Cooper and Hank Lucero settle into their new partnership as they spend a shift answering a variety of strange calls.

Judy forces Josh to choose between her and his new best friend when she finds out his pal is the upstairs neighbour she claims caused water damage. Andrew asks Nick the doorman to help him assemble Wyatt's new playpen.