Farscape: Exodus from Genesis

Season 1, Episode 2 (on Apple's box set) — Exodus from Genesis 

Is this about Peter Gabriel's departure from his prog-rock band, only to be replaced by Phil Collins, then the band turns power-pop? 

Maybe. 

It more reasonably appears to be the trope-y "Aliens tribute" episode that every SF show eventually does. Except... it's not? Not entirely? We learn that Aeryn, like all Sebaceans, is unable to regulate her body temperature against heat. 

The crew is being pursued by Crais' (rogue?) Peacekeeper faction, and flies into a nearby nebula-cum-anomaly to hide from them. Unfortunately, they pick up a passenger entity: an alien lifeform. It releases chitin-covered critters (they move like DRDs) that stay hidden and occasionally stab the crew from cover. Not a great guest for Moya's hospitality. It also start ramping up the heat onboard, blocking ventilation shafts, and Aeryn starts to overheat. 

The alien lifeform starts cranking out doppelgangers of the crew, sowing confusion. The crew fights the critters and their own dopplegangers, which display awareness and even some shared muscle memory (Crichton notes his copy uses his own fighting moves against him), but the dupes cannot talk. Moya hosts a running battle inside of her, the crew against the voiceless swarm. 

It injects Pa'u Zhaan with a venomed claw that turns her into a puppet for the entity. The voiceless swarm finally finds a voice. Though initially defensive, after a sovereign-ruler-to-sovereign-ruler pow-wow with Rygel, the swarm agrees to cordon off a portion of the ship allowing Aeryn to stabilize, as long as no-one interferes with its reproductive process. 

Then the Peacekeepers return. Fuck. 

Crichton determines it's better to crank the heat up, Aeryn appear to agree (whaaaa?) and he and D'Argo roll out and fuck up the heat-challenged Peacekeepers, send them packing. 

A nice inversion of the "alien invaders on our ship" trope, bravo.