The AI aboard the SPT-LZ-00X Layzner, its intelligence was so advanced that it developed an actual personality of its own which was nicknamed &quot;Rei&quot; by Eiji. Despite having feminine characteristics and the nature of a sweet child, Rei had no notion of morality and would usually recommend destroying the cockpit of an enemy SPT-instantly killing its pilot-rather than disabling its limbs as she believes that this is the most effective way to defeat an enemy. Often, she would seize controls of the Layzner herself in order to protect Eiji and the SPT from damage.

The SPT Lazner is a super-powered, computerized Tracer robot. It is the strongest robot in the universe. The story's hero, Eiji, is the child of an earthman and an alien from another planet. He happens to find out about a conspiracy to destroy the earth. Using Lazner and with his friends’ help, Eiji decides to save his father's planet earth and fight against his mother's planet to achieve peace in space. 
 
The Story takes place in an alternate reality based in the year 1996, where humanity is advanced enough to develop long-range space travel. 
 
(SOURCE: AnimeNewsNetwork)

The Layzner OVA serves as an alternative version of the TV series. 
The first episode, titled "Eiji 1996", recaps the first part of the series (episodes 01-24). 
The second episode ("Le Caine 1999") takes place after a time skip, and contains episodes 26 through 37 (episode 25 of the TV series, being a recap itself, is skipped here). 
The final episode, "Seal 2000", is an expanded version of the final episode of the TV series (38) and features new animation and a longer epilogue.