Booth's gambling relapse is taking him to a new low on Bones.

On Thursday's episode (8/7c), which sees Booth (David Boreanaz) and Cam (Tamara Taylor) travel to Iran to rescue Arastoo (Pej Vahdat ), Brennan (Emily Deschanel) also learns about the return of Booth's habit. Perhaps that's because — as seen in the exclusive first look below — Booth very sneakily uses Brennan's medical expertise to help him decide which way to bet!

Check out all the new fall shows!Click play below to see how Booth slyly uses an unwitting Brennan's "genius" for his own gain — and just how deep in debt Booth has become.

Bones airs Thursday at 8/7c on Fox.