Why Gundam Sentinel’s Zeta Plus Ended Up on a Playing Card

SD Gundam Zeta Plus Playing Card from Comic BomBom, February 1990

A Furoku Card from Comic BomBom’s SD Gundam Era

This is one playing card — the four of clubs — from a 54-card SD Gundam trump set that came sealed inside the February 1990 issue of Kodansha’s Comic BomBom magazine. In Japan, furoku (magazine supplements) have a long tradition in children’s publications: rather than being sold separately, these bonus items were bound into the magazine itself, available only to readers who bought that particular issue. The trump set format placed different SD Gundam characters across each suit and number, making the complete deck a cross-section of the franchise’s roster at that moment. This listing is a single card from that set, not the full 54.

Zeta Plus and the Gundam Sentinel Photo-Novel

The mobile suit on this card is the Zeta Plus, a machine whose origins sit well outside mainstream Gundam television. Gundam Sentinel was serialized in Model Graphix magazine from 1987 to 1988 — not as a manga or animated series, but as a photo-novel: studio photographs of scale models combined with prose narrative. Mecha designer Katoki Hajime contributed designs to Sentinel that have remained influential among mechanical design enthusiasts. The Zeta Plus (MSZ-006A series) was conceived as a mass-production derivative of the Zeta Gundam, set in Universal Century 0088, with several variants including the A1 and C1 types. The “A2” marking visible on the card’s shoulder detail likely refers to the second unit of the A1 variant, though that interpretation is not definitive.

Crucially, Gundam Sentinel was never adapted into animation — an OVA was attempted but never completed. The Zeta Plus exists almost entirely through model kits and licensed merchandise, with no broadcast history in any market. That gives it a distinct place in the Gundam universe: widely recognized among dedicated fans of mechanical design, yet invisible to casual audiences who grew up watching the main television series.

SD Gundam at Its Peak, and Why Sentinel Made the Cut

The SD Gundam sub-brand launched around 1985–86, presenting the franchise’s suits and characters in a chibi, heavily deformed two-to-three-head style. By 1989–1991 — precisely when this card was produced — the brand was at its commercial height in Japan. New BB Senshi model kits released monthly, and Comic BomBom itself ran popular SD Gundam manga, including SD Gundam Gaiden: Knight Gundam Legend. Bandai held SD Gundam licensing rights; Kodansha, as BomBom’s publisher, worked closely with Bandai to deliver furoku that complemented the magazine’s coverage. That a Gundam Sentinel mecha appeared in this set reflects just how thoroughly the SD Gundam brand absorbed the franchise’s extended universe — even titles that never made it to television.

For collectors outside Japan, furoku items from this period are seldom encountered. They were never sold through retail channels, entered circulation only through magazine sales, and are now more than three decades old. Comic BomBom has enough recognition among international anime and manga enthusiasts that its furoku items carry clear provenance as genuine period pieces from the heart of Japan’s SD Gundam boom.