Farscape/Recap/S03 E19 I Yensch You Yensch

Season 3, Episode 19:

I-Yensch, You-Yensch
The crew commence their plan to get aboard Scorpius' command carrier. D'Argo and Rygel meet with Scorpius and Braca at a neutral location. Despite interference from a pair of inept thieves, they manage to broker a deal: Crichton and the rest of the crew will be invited aboard the command carrier as honoured guests while Crichton assists with the wormhole research. To ensure there's no foul play, both Scorpius and Crichton will wear I-Yensch bracelets, which synchronise each other's nerve impulses and ensure that if one of the pair is hurt or killed, the same thing will happen to the other.

Meanwhile, Talyn is descending further and further into madness as a result of his conflicting Leviathan/Peacekeeper biology. Things come to a head when Talyn, in a panic, destroys an unarmed transport full of civilians. Crais wants to take Talyn to a facility where his biologicals function can be shut down until the defective elements of his personality can be repaired: doing so will effectively kill the Talyn they know, but if they don't, Talyn is bound to have more emotional problems down the line and cause more damage. After Talyn actually fires on Moya in a fit of paranoid rage, Aeryn agrees to Crais' plan and manages to talk Talyn down, convincing him that a shutdown and repair is necessary.