Farscape/Recap/S03 E14 Infinite Possibilities Daedalus Demands

Season 3, Episode 14:

Infinite Possibilities, part 1: Daedalus Demands
The crew of Talyn are contacted by "Jack" the Ancient, who has evidence that someone else has a module like Crichton's, along with a working phase stabiliser that allows for safe wormhole travel. Crichton realises that it's Furlow, the alien who took scans and data from Crichton's earlier wormhole experiments. With Jack aboard, Talyn heads to Furlow's planet, while Rygel identifies the alien flying the recorded module as a Charrid -- a race that's recently allied with the Scarrans.

When the crew arrives, they discover that solar flares are occurring frequently and one of them blinds Crais and Talyn. Worse, an armed force of Charrids has taken control of Furlow's compound. Crichton, Aeryn, Jack and Rygel fight the Charrids off, capture one for interrogation and rescue Furlow, who admits that she copied the designs of Crichton's module and hired Charrid mercenaries to do the test flights. However, they turned on her after the Charrids allied themselves with the Scarrans -- and under Rygel's interrogation, the Charrid prisoner reveals that a Scarran Dreadnought is on its way. Even if the crew destroy Furlow's module and her computers, the Dreadnought has a copy of the phase stabiliser plans.

While Aeryn and Rygel defend the compound, Jack comes up with a plan: he can unlock the wormhole knowledge in Crichton's brain, and together they can convert Furlow's phase stabiliser into a weapon capable of destroying the Dreadnought. Crichton reveals the presence of Harvey, who must be purged from Crichton's brain first to prevent the knowledge possibly getting back to Scorpius. Jack begins a process that should get rid of Harvey, and in Crichton's head, the pair fight on a rollercoaster before falling off. After Jack is finished, Crichton wakes up, only to reveal that Harvey is in control now...