Heisei Kamen Rider 20 Series: Supplementary Plan is a four-episode "Telasa Original" web miniseries serving as supplementary material to Kamen Rider Zi-O.
| Created By | ||
|---|---|---|
| Status | Ended | |
| Original Name | 平成仮面ライダー20作補完計画 | |
| First Air Date | December 14, 2018 | |
| Last Air Date | December 14, 2018 | |
| Seasons | 1 | |
| Episodes | 1 | |
| Episode Runtime | 0min | |
| Language | — | |
| Original Language | Japanese | |
| Production Countries | Japan | |
| Production Companies | ||
| Networks | TELASA | |