Mobile Suit Beta Gundam
An Alternate Universe UC era Mobile Suit Gundam.
Basically it takes place after the end of Mobile Suit Gundam so the history and lore is pretty much the same save for one major difference: Zeon won the One Year War.
Basically the premise is that before the Battle of A Baoa Qu, Gihren Zabi anticipated that Kycilia would try to avenge Degwin so he killed her and covered up her death as a war casualty. This boosts Zeon's morale in wanting to avenge Kycilia and Degwin, and Zeon wins the Battle of A Baoa Qu and eventually forces the Earth Federation to surrender.
What we see is Mobile Suit Gundam meets The Man in the High Castle where former EFSF soldiers lead by Bright Noa are plotting to overthrow Gihren, who controls both Earth and the Sides as a ruthless dictator.
Bright establishes a pact with Anaheim Electronics to utilize two prototype Gundams in the fight against Zeon. Amuro returns as the main protagonist and is forced to fight alongside Io Fleming from Gundam Thunderbolt. The two don't get along at all, but are forced to work together in the fight against Zeon.
Meanwhile, Char is promoted to General of Zeon's army for his heroism at A Baoa Qu, yet is secretly plotting a coup de tat against Gihren to get his revenge on him and reclaim his rightful place as Zeon Zum Deikun's heir. He's also planning to settle the score with Amuro over Lalah Sune's death.
Daryl Lorenz from Gundam Thunderbolt is hailed as a war hero and used as a propaganda tool by Gihren Zabi. Also his loss of all his limbs, Karla losing her sanity, and his survivor's guilt over being the last of the Living Dead Snipers has caused him to suffer from crippling depression and alcoholism.
Sayla returns as Amuro's love interest, and Bianca Carlyle for Io. Other characters return like Kai, Mirai, Hayato, Frau, Kamille, Jerid Messa, Four Murasame, Judeau, Puru, Kou Uraki, Anavel Gato, Haman Karn, Mineva Zabi, Shiro Amada, and Aina Sahalin.