On The 100 Lincoln is viewed as one of these by other Grounders, having betrayed them to help the Sky People who had invaded their territory. It takes a while to convince other Grounders that the Sky People aren't actually trying to conquer them, even if some of their actions are thoughtlessly destructive.
Secret Army'sfar more well known parody'Allo 'Allo! featured a small Story Arc where General Von Klinkenhoffen decided to give René a "collaboration medal" after he unwittingly helped the General. People started vandalizing his cafe; his allies, La Résistance, threatened to shoot him if he accepted and of course, the Nazis threatened to do the same if he refused. Luckily for Rene, the General changed his mind about giving him the medal.
Alta Mar: A major part of the season 1 plot involves Carolina and Eva trying to figure out which of their family members were collaborators with the Nazis.
One episode of The Americans sees Phillip and Elizabeth travel to Massachusetts to track down and eliminate a Russian immigrant who aided the Nazis during World War II, but are conflicted about the assignment after learning that the woman was far from a willing participant. They carry out the hit anyway, but afterwards, Elizabeth suggests that maybe it's time for them to get out of the business.
Andor: While most of the residents on Ferrix begrudgingly put up with Imperial occupation the locals do not like the Empire with several casually working for the resistance and the entire community banding together for mild anti-Imperial activities. Nurchi works with the Imperials out of greed, helping turn in subversives and hunt down Cassian despite the rest of the community banding together in support of the Andors.
The Nightwatch serves to inform the Clarke government about potential threats to its rule, at least some of them knowing what they were serving.
Also that political officer lady assigned to Captain Sheridan in one episode. She knew the Clarke administration was evil, but she still served it. She even showed just how much her skewed value system affects her judgment when she clumsily tries to seduce Sheridan ''and is honestly surprised when he's not even remotely interested in a totally naked woman offering herself completely to him.
A more ambiguous version is Na'Far, the new Narn ambassador under the second Centauri occupation. Their situation is desperate and the terms of their surrender are unbelievably harsh, so he may have a point about preserving as many Narn lives as possible instead of provoking their occupiers with an armed resistance, like the one G'Kar has been organising. In the end, it's still not clear if he's a genuine quisling, or if he's just as desperate as G'Kar to save their people and just happens to disagree with him about the best way to do it.
A major plot point was this in the third season of Battlestar Galactica, where a number of humans volunteer as security officers to enforce Cylon rule over the human survivors. Gaius Baltar becomes the Cylons' Quisling, though he literally has a gun to his head.
In Colony, Los Angeles has been invaded and occupied by a mysterious party. Naturally, there are collaborators - some, like Proxy Alan Snyder, are sincere in their devotion to the invaders, while others, like protagonist William Bowman, are only going along with it in order to survive.
A surprisingly sympathetic portrayal is shown in "Day of the Daleks" where a future Earth has been taken over by Daleks but essentially run by collaborating humans who make things harsh and difficult to please the Daleks (and themselves) but nowhere near as dangerous as if the Daleks where running things directly.
In "The Invasion of Time, Gallifrey is invaded by the Vardans and the Sontarans. There's a slimy Time Lord who co-operates with both invaders and with the Doctor, who is pretending to be a collaborator himself.
The revived series introduced a race called the Tivolians who are so used to being conquered they've completely given up on resisting and now willingly comply with anyone who tries to invade their planet. Apparently their planetary anthem is titled "Glory To <Insert Name Here>" just to save time when someone new takes over. The Doctor has little sympathy for them because they're such Dirty Cowards who let others die to save their own hides.
Dominion has the Black Acolytes, the Cult that still worships Gabriel and the other angels, apparently having deluded themselves into believing that they'll be spared when the rest of humanity is wiped out.
A French Village: The French government officials collaborate, mostly not out of any sympathy for the Germans, but to protect their people. Businessmen like Raymond also work with the Germans, though again not from sympathy and he tries to help Jewish businessman Crémieux whose company is being seized. Others however like those from the Vichy regime are enthusiastic collaborators in many cases. Sarah though tells Daniel that honest, good people such as him who collaborate aid others who aren't, since the evil ones couldn't do it without their help. He's visibly shaken by her statement.
In the Law & Order episode "Night and Fog," the wife in an elderly Jewish couple apparently kills herself through overdose. Further digging on the husband reveals that he was part of the Nazis' brutal ghetto police unit back in the old country. The dishonor is great enough for him to kill to keep it hidden.
De Nieuwe Orde is a documentary series that has this as its main subject.
In "The Deprogrammers", Evan and Jill Cooper are horrified to discover that Professor Trent Davis and the other apparent Vindicators are in fact in the service of a Torkor named Megwan.
Played with in "The Camp". The prisoners believe that the overseers are humans who are collaborating with the New Masters. In fact, they are androids who have run the camp for its entire twelve generation existence. When Prisoner 98843 begins working with the Commandant, the other inmates shun her as they regard her as a collaborator. However, she proves her loyalty when she tells them of the overseers' android status and that they are severely weakened due to having gone decades without repairs. She then urges them to fight back, which leads to a successful slave revolt.
In "Starcrossed", Alexandra Nevsky collaborates with the Hing, assisting High Centurion Sulat Ray in his search for Cass Trenton and Winston Meyerburg, but eventually has a change of heart and decides to join the NATO resistance.
People of Earth has Officer Glimmer, a cop in Beacon who helps cover up the aliens' activity in exchange for cash to pay off his gambling debts.
In Quantico, Dayana Mampasi, a dedicated human-rights lawyer, might seem like an odd choice for a CIA recruit, until you learn that her parents were collaborators with Robert Mugabe's regime, and it's implied that she herself was trained in how to torture people.
Secret Army centers around a Belgian café frequented by German officers, which acts as a front for smuggling allied airmen out of the country - until it is trashed by a mob incensed at their "collaboration".
Sliders: In "Asylum", Margaret Thatcher collaborated with the Kromaggs when they invaded her Earth. She agreed to give them access to the oil reserves in the North Sea in exchange for leaving the United Kingdom alone. After the end of the Kromagg War, collaborators (such as Grace Venable, whose real name is Helen Donovan) came to be known as "Thatchers."
SS-GB: The main character, plus the rest of the Metropolitan Police Service and the British puppet government, work with the German occupiers.
Stargate Atlantis: The Wraith regularly wipe out inhabited worlds to feed on the humans. Nevertheless, they also have a few thousand human followers who worship them and are mostly used for infiltration purposes. They're converted by getting fed on repeatedly only to have their lives restored to them. The experience is so traumatic and addictive that they become mindlessly loyal to their Wraith masters. Every other Pegasus human understandably despises them for their treachery.
Many of the plots of Star Trek: Deep Space Nine deal with real or perceived collaborators with the Cardassian, and later Dominion occupation, including Kira's mother and (arguably) Odo.
After the Dominion takes control of the Deep Space Nine, Kira remains on the station as the representative of Bajor. At first her intention is to maintain the neutrality of her home planet, but after a while she discovers the tragic irony of her slowly slipping into becoming herself what she always despised - a collaborator. Fortunately, as soon as Kira figures that out, she snaps back to her badass self and leads the resistance as quietly as she can to get the Dominion gone from Bajor.
Although, the Federation isn't occupying Bajor or in any way its enemy — it's only that loyalty to her friends and to what's right sometimes conflict with her loyalty to her people. Some of her fellow Bajorans are just a little quick on the Category Traitor trigger.
Once it becomes clear that the Dominion's "alliance" with Cardassia is conquest in all but name, Puppet King Damar renounces his allegiance to them and leads Cardassian patriots in open rebellion; the Dominion quickly finds replacements for Damar to command the remaining loyal Cardassian forces. However, when the entire Cardassian military turns on them, the Female Changeling has had enough and orders the extermination of every Cardassian, including the Quislings.
The Star Trek: The Next Generation episode "Allegiance" portrays Mizarians as a Planet of Hats, with the hat being "collaborator". Picard mentions they have a long history of being conquered because they don't resist aggressors, and it's one of the clues that helps him reason out why he, a Mizarian, and two others have been imprisoned. They're being studied because of their very different relationships to the concept of authority.
Donovan's mother Eleanor is a collaborator of the foulest variety; a self serving opportunist (who intentionally resembles Nancy Reagan) who has neatly deluded herself that she won't be on the next Visitor menu the moment she exhausts her usefulness. She sells out the Visitors the instant it seems the Resistance is winning. She still wasn't willing to shoot her own son when she caught him during one of his missions, as Donovan himself pointed out ("Even you're not that cold, Mother"). She just fired in the air, and then tore her dress to make it look like she'd fended him off.
Daniel Bernstein, an unpopular teenager who finds power by joining the Visitor youth corps; he becomes a despicable bully, betrays members of the Resistance to the Visitors, and personally kills one of them, an old woman who used to be his neighbor. The Resistance retaliates by framing him for their abduction of a Visitor officer; he's dragged off to become food for the Visitors. Karma's a bitch.
In exchange for being left alone, Micah and his followers at Eden signed a treaty with the vampire Magdalene, promising her a regular supply of blood. Unbeknownst to the others, Magdalene was Micah's wife, and he was also slipping her the occasional newborn, who she gave to Julius as a delicacy.
Numerous humans also serve the vampires in return for being left alive. They can generally be identified by red bands around their arms. Dr. Sholomenko is one prominent example, working with the vampires to find a way for them to procreate naturally.
War and Peace (2007): Unlike in the book, Prince Vassily and his daughter Helene outright aid the occupying French forces.