this has to be the worst OVA in anime history! OVA's as a rule are not part of the main sereies. this is allright and can be fun to see the character's in a different way. that being said this OVA is trash and here is why......
Story: Please note this is not part of the main series. with that they tried to tell a different and complex story with not enough time to tell all of it. eureak is a spy robort, the grew of the geko state are dying, aging poeple and nervosh is a space puppy. that make no senese to? well thats the OVA! it could have worked as a mini series but not as a ova.
Art: Is 70% new with 30% used from the anime series.( why some people may thought it was part of the series) they used the old sences in this ova a lot, which was horrible for them to do.
Sound: rember how the series had some great BGM's and music:) the ova had none. the ending song (if you can even call it that) was lame. there was no effort at all. the vocie acting is the only nice thing i can say about this ova.
character: they took what i love from series and did there best to kill it. the only 2 that was some what right was eureka and renton. even then that was bad.
enjoyment: beside the fact when the pain stop and i felt better after the ova? none. this a epic fail of a ova.
Overall: DO NOT WATCH THIS OVA! if you loved the series or going to watch it. this is my warning please take care to avoid it.