This article is about a/an substance in Kamen Rider, the original series.

Gelper (ゲルパー薬 Gerupā-yaku, Gelper medicine) is a drug that was developed by Gel-Shocker to ensure no dissent among their soldiers. Once the drug was introduced into their systems, they would need to take it every three hours lest they combust, making capturing them for information more difficult then their Shocker predecessors. Gel-Shocker Appears! Kamen Rider's Last Day!


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