Mecha Anime
Maps (1987)
While looking for the ledgendary Mapman, the last surviving member of the Nomad Star tribe, Lipumira finds him in Tokyo. His name is Gen Tokishima and he is the only one able to get one part of the starmap hidden within the Earth. After retrieving the piece, Gen must make a decision to follow Lipumira in her foolhardy search to find the remaining pieces of the starmap or stay on Earth. He makes his decision, only to find his girlfriend has beaten him to the spaceship as she wants to come as well. Unfortunately, as Gen learns the secret of the starmap, Lipumira's sisters have plans to stop her and will stop her at any cost.
(Source: Anime News Network)
Nekketsu Saikyou Go-Saurer
The Kikaika (literally mechanization) Empire invades our solar system, and in a matter of moments they take over and convert Neptune, Uranus, Saturn, Jupiter,and Mars, and set their sights on Earth. However, one thing stands in their way. Earth's ancient protector and soldier of light, Eldoran. To fight this menace he gifts a 5th-grade class with 3 huge robotic dinosaurs, with the power to merge and form the giant robot Gosaurer, which they then can pilot and use to stop the Kikaika Empire's advances.
(Source: Anime News Network)
Soukou Kihei Votoms: Case; Irvine
Irvine Lester is an AT repairman. In order to make a living with his sister, he is secretly fighting in AT gambling matches and intentionally losing the games for money. But the other fighters find out about his excellent AT maneuvering skills and demand a real match.
Soukou Kihei Votoms: Kakuyaku taru Itan
Chirico is awoken from cold sleep and separated from Fyana. His attempts to find her come to the attention of a Nextant, the replacement for the Perfect Soldier program. At the same time, the new Pope is to be nominated, and Chirico is religiously considered to be "The Untouchable". With one of the nominees related to the Nextant, Chirico's actions will have far-reaching political ramifications.
(Source: Anime News Network)
Soukou Kihei Votoms: Red Shoulder Document - Yabou no Roots
After armored trooper pilot Chirico Cuvie is given orders to transfer to Planet Odon, he and all of the other new recruits are sent into a simulated battle to test their abilities. However, this 'simulated battle' turns out to be a serious fight to eliminate those without the necessary skills. Chirico survives along with just three others, despite the fact that he fought while injured. It soon becomes apparent that this is not the first time he has survived against incredible odds, a fact that Colonel Peruzen wishes to exploit. But is Chirico truly immortal?
(Source: Anime-Planet)
Soukou Kihei Votoms: VOL.I STORIES OF THE A.T. VOTOMS
Transformers Masterforce
Even though the Destrons have been driven off Earth, a small team of Cybertron Pretenders have remained behind, just in case. Led by Metalhawk ("Hawk" in his human identity), the Pretenders live among the humans, using their Pretender shells to assume human size and appearance. The Cybertrons' caution is rewarded: Destron Pretenders soon appear, led by a mysterious force called Devil Z. The Cybertrons and Destrons soon build up their forces, recruiting humans to become Junior Headmasters and Godmasters (Powermasters).
(Source: Anime News Network)
Transformers: Robot Masters
In 2004, Optimus Prime is alerted to a disturbance at the gates of Autobot City; a force of Decepticons led by a vicious new enemy, a Tyrannosaurus rex calling himself Megatron!! Autobots and Decepticons from across the eras have converged on this time to clash over the newly-discovered energy source solitarium!
Transformers: Scramble City
Beginning with a recap of the coming of the Transformers to Earth and the story of Devastator, the OVA then gets its original story underway, as the Autobots are shown to be in the midst of constructing the powerful "Scramble City," overseen by their newest arrival, Ultra Magnus.
When the Decepticons learn of this, their combiner robots are deployed to attack, and a battle between them and their Autobot counterparts ensues.
(Source: Wikipedia)