- Note: OER is a term invented by fans, and hence is not official. This category and related articles consists of original research, and is likely to contain inconsistent or incomplete information.
The OER is an initial line of model kits that were released under the name Zoids. This was the first such release in Europe.
- Mechabonica (Called "Zoids" in OER, Models names were different)
- Robo Strux (Called "Zoids" in OER)
- Power Zoids
- Spider-Man and Zoids (accompanying factions and comic)
- Super 1000 Zoids
|???(initial)||Europe||Tyrannazoid, Terrazoid, Spiderzoid, Aquazoid, Protozoid||These Zoids were unnamed|
|???||Europe||Tyrannazoid, Terrazoid, Spiderzoid, Aquazoid, Protozoid||These Zoids re-released with names|
|???||Europe||Serpent, Tank, Giant ZRK||battery-operated|
|???||Europe||Serpent, Tank||Comic added, Zoids recoloured to match.|
|???||Europe||???||Other Japanese Zoids were released, but recoloured.|
|???||Europe||Spider-Man and Zoids||Comic released|
|???(last)||Europe||Super 1000 Zoids|
In total, 48 different Zoids were released as part of the OER line (not including variants, contest prizes and unreleased models). No accessory sets were released. The OJR Terrestrial Soldiers set featured in the comic and a 'Diorama Crater' was available as a mail-away prize. A series of promotionnal items was also released.
Due to Tomy having several manufacturing plants, different versions of each Zoid exist. Such differences are caused by the molds not being identical and though they are slight (more/less detail, larger/smaller mounting points etc) they often mean that parts from one version of a Zoid are not compatible with another version. In general, Zoids made in Japan have better detailing and plastic quality than those made elsewhere (Singapore and France).
Because the "OER" is a fan-term, precisely which Zoids constitute it can vary. Some inconsistencies arise with the notion of "left-over stock". Some fans consider left-over OAR Zoids released in Europe to be part of the OER. Others group this as part of an European release of the OAR. Since there is no definitive source for this term, precisely which years, countries and regions the OER covers, varies from person to person.