"The Great MacGrady" "Binky vs. Binky" "Room to Ride" - Arthur
The children's show Arthur featured Lance Armstrong in three episodes, the last one being in 2009. It was quickly kicked out of the rotation in the network after the doping allegations against Armstrong turned out to be true in 2012. The episodes haven't been aired since, except for "The Great MacGrady," because they totally edited his weird bunny character out of the episode.
"Unstoppable" - Law & Order: SVU
This episode was never aired due to bad timing. It was filmed in 2014 and slotted to air in 2015, but that was around the same time that the presidential campaigns began. The episode was about a narcissistic man who runs for president and is accused of sexual assault. The episode hit a little too close to home, and the producers were afraid that the episode would make it seem like they were making light of the very reality of America. Ice T confirmed that they filmed it but said it'll probably never get released since so much time has gone by.