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)
OVA - Apr ??, 1986
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!
Special - Jul 15, 2004
To follow in his missing friend Masato's footsteps, Ryo joined the vehicle company Yaesu. Ryo became involved with the Makuhari test course that Masato was also a part of. The leader, Gray Gear, told Ryo, "If you want to know about Masato, come to the test course late at night and ride the new machine." When Ryo got in the new machine, the Vector Versus, and rode it around the course, he was able to exceed 300 kilometers per hour and suddenly warped into a mysterious space!
OVA - Dec 11, 1992
One relaxing Sunday, Licca tags along with a friend to babysit two rather grumpy little boys.
OVA - Jul 21, 1992
Based on the popular Licca doll in Japan. Licca meets a mysterious cat. Licca goes on vacation with her father. The town in the mountains they go to is the site of a festival of the stars that has a mystical background, which is more real than Licca expected when she ends up in the middle of the mystical battle for the festival. (Source: AniDB)
OVA - Sep 12, 1997