Right to Remain Silenced

 is the seventeenth episode of the fourth season and the seventy-fourth overall.

Synopsis
Simmons manages to enter Red Base by correctly guessing the weak password established by Grif and Donut. Simmons wants to report the Blues' plans, but Sarge still considers him a traitor and insists on holding a trial with himself as both judge and prosecutor. This trial is quickly aborted, however, when Grif argues that Donut will want to act as a bailiff in hotpants. As a result, Simmons' sentence is summarily commuted to the payment of a hefty fine, to be split between Sarge and Grif.

Meanwhile, O'Malley, Doc and Lopez return to the gulch. As O'Malley approaches Blue Base, he is greeted with a "warning shot" from Church, who reveals to Caboose that he was actually trying to hit O'Malley. O'Malley accuses the Blues of attempting an ambush, but Church explains that he just wants to establish a few ground rules at the outset: O'Malley is supposed to enter the base, give a diagnosis for Tucker, and then leave. In exchange, O'Malley demands something "mysterious", "frightening", and "pure evil", as well as a 20-dollar upfront copayment. Church agrees and asks Caboose for 30 dollars.