Descendants: Wicked World, on Disney Channel / Watch Disney Channel & YouTube
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Caution: potential spoilers.

This CGI series, based on the live-action TV movie Descendants, aired on Disney Channel as well as streaming online, between September 2015 and February 2017. But I didn't watch season 1 until August 2019, around the time the third "Descendants" movie premiered. I didn't watch season 2 until July 2020. Before I watched the series, I assumed I would categorize it as either "webisodes" or a web series. But since it aired on TV as well as online (and episodes range from nearly 2 minutes to a little over 4 minutes), I decided to call it a microseries, instead. (But I'll include a link in the animated webseries section.)

Season One
First I want to mention that the children of villains are referred to as "VK's," for "Villain Kids," which I have no recollection of whether or not that was a thing in the first movie. (And the Auradon Kids are "AK's.") Anyway... the first few episodes are about preparations for a "Heroes and Heroines Festival." The series also introduces some new characters, including an AK named Jordan, the daughter of the Genie from Aladdin. And she hosts a web show. Another new character is a VK named Freddie, the daughter of Dr. Facilier from The Princess and the Frog. She soon begins attending Auradon Prep. Another AK the series introduces is Ally, the daughter of Alice from Alice in Wonderland. The last several episodes of the season involve preparations for the Neon Lights Ball. And Jane starts using magic, which her mother (the Fairy Godmother) had forbidden her from doing. And between episodes 15 and 16, there are some live-action shorts called "Jordan's Blue Carpet Minute" (which the wiki informs me were part of a special called Neon Lights Fashion Moment). In each short, Jordan has a brief interview with a different attendee of the ball. (While they're all played by the voice actors from the series, Jordan herself is played by someone else in these live-action segments.) When the regular series resumes, we're introduced to a VK named CJ, the daughter of Captain Hook, who tries to ruin the ball.

Season Two
The VK's learn that the AK's had each received their own "birthright jewel" years ago, when it was determined that they were "good." And now there's an upcoming ceremony called "Jewel-bilee" to give birthright jewels to the VK's. (Their jewels had been taken by the authorities when the villains were all imprisoned on the island.) But Mal finds out her mother had hidden her own jewel before it could be taken, so she goes to the island (with Freddie tagging along) to search for it. She doesn't find it, but Freddie does find a necklace that she gives to Mal. But the necklace turns Mal evil, so when they get back to Auradon, she causes trouble for a few episodes. Finally, the cause of that is found and Mal returns to normal. But before that, she had stolen Jafar's staff from the museum and given it to a shadowy figure, who we later learn is Zevon, the son of Yzma from The Emperor's New Groove. He steals all the jewels to put into the staff to give himself enough power to take over Auradon, so the VK's and AK's have to work together to stop him. And of course the final episode is the Jewel-bilee, complete with a song and dance number, "Better Together."