Mobile Suit Gundam ZZ

Kidou Senshi Gundam ZZ
機動戦士ガンダムZZ

Prequel

Kidou Senshi Z Gundam
機動戦士Zガンダム
novel

The year is Universal Century 0087. Seven years have passed since the end of the One Year War. In its zeal to stamp out any remaining opposition, the Earth Federation has organized the Titans, an elite fighting force. However, the Titans soon get out of hand, committing atrocities on par with the worst the Principality of Zeon had to offer during the war. In response, dissatisfied citizens, former Zeon soldiers, and even members of the Earth Federal Forces form a resistance group known as the Anti-Earth Union Group, or AEUG. As the next war is brewing, a small AEUG group arrives at Side 7 to investigate the new Gundam Mk. II... (Source: Anime News Network)

Sequel

Mobile Suit Gundam: Beltorchika's Children
Kidou Senshi Gundam: Gyakushuu no Char - Beltorchika's Children· 機動戦士ガンダム 逆襲のシャア ベルトーチカ・チルドレン
novel

The original modified Hi Streamer storyline proposed by Tomino for the Mobile Suit Gundam: Char's Counterattack movie, it was rejected and released instead as a novel. (Source: Gundamwikia)

Alternative

Gundam ZZ
Kidou Senshi Gundam ZZ· 機動戦士ガンダムZZ
manga

The Axis, which was supposed to have been struck by Camille, is still alive! Our new hero, Judau Ashta, gets into the super mobile suit "ZZ Gundam" and fights against them!