All Fall Down: Along with receiving a new pair of legs, Pronto is conditioned to attack his closest friends, and to love the idea.
The brainwave scanner in the G.I. Joe comic was a feared — and painful — method of brainwashing. It could eventually be broken by a strong-willed individual, and if one was a master of the "Arashikage mind-set" one could free others as well.
Judge Dredd: Judge Death likes to do this to some of his victims, mind controlling them to go on killing sprees. He made Judge Kraken an honorary Dark Judge to help in carrying out "judgment" on the people, leaving Kraken aware enough to know what he's doing and being able to do nothing but weep as he slayed. Several Death impersonators also went crazy and started to think they actually were Death.
The Powerpuff Girls story "Micro Managing" has the Micro-Puffs (mischievous tiny sprite-like avatars of the girls) brainwashing Bubbles and Buttercup in their sleep into thinking they're each leader of the team, which causes crimefighting missions to go a little haywire. It doesn't work on Blossom since she's already the leader. After Bubbles is the first to be brainwashed:
Buttercup: What's with Señorita Crazy-Pants? Blossom: Napoleon complex, I guess. It'll wear off.
During the "Enerjak Reborn" arc, Knuckles was brainwashed by Dr. Finitevus into absorbing the Master Emerald's power and becoming the new Enerjak. It took his father's Heroic Sacrifice to snap him out of it.
This happens twice during the Iron Dominion arc: First, the Iron Queen uses her Magitek powers to take control of Monkey Khan and use him to destroy the Dragon Kingdom Freedom Fighters. Then, she uses those powers to reprogram NICOLE and use her to effortlessly take over New Mobotropolis. Khan was released by the Queen when she didn't need him anymore, and NICOLE was soon returned to normal by Sally (though she continued to pretend to be brainwashed for a while).
Star Wars: Kanan: Commander Grey goes from happily chatting with Depa Billaba and Caleb Dume to trying to murder them within minutes of Order 66 being issued. He eventually manages to snap out of the programming several months later after speaking with Caleb, who points out everything wrong with the "Jedi are traitors" scenario.
Tintin: This is the effect of the Rajajah poison on Didi, the son of Mr. Wang in The Blue Lotus. He gets obsessed with cutting people's heads off so they will learn "the Truth" as "Laozi said".
In Violine, Violine's father is hypnotized into killing Violine.
In Y: The Last Man Yorick's sister Hero falls under the influence of Victoria, the man-hating cult leader of the Daughters of the Amazon, so much that she's prepared to kill her own brother, as well as shooting a young girl in the head on Victoria's order. Even after Victoria is killed Hero still has her voice inside her head.
