Don ZenkaiOh (Japanese ドンゼンカイオー, Don Zenkaiō) is a special combination from Avataro Sentai Donbrothers (暴太郎戦隊ドンブラザーズ), the 2022 season centered on the Donbrothers team and its red leader Don Momotaro. It is not the season's regular main mecha (that is Don Onitaijin) but a crossover unit bridging to the immediately preceding series Kikai Sentai Zenkaiger (2021): Don Momotaro's motorcycle-mecha Enya Ridon (エンヤライドン) merges with Zenkai Juran, carried over from Zenkaiger.

For the combination (battle call "Don Zenkai Gattai"), Zenkai Juran assumes its dinosaur mode Juran Tyranno to form the torso and legs, while Enya Ridon supplies the head, upper body and weapons. The result is an all-red robot with a visor-like head, a shield and a blade weapon. Its defining trait is that it is built from parts belonging to two different Sentai seasons — a deliberate season-transition gimmick.

The DX toy is made by Bandai (Japan), mostly of plastic (ABS/PVC) with clear parts for the shield and blade; the assembled figure stands roughly 260 mm tall. Enya Ridon can be played with on its own as a roll-along motorcycle (spinning Sentai Gear, movable exhaust parts) and seats the separately sold Change Heroes Don Momotaro figure as its rider, while the Zenkai Juran unit contains a sound module that plays effect audio in sync with the combination. Bandai issued it two ways: as the standalone DX Enya Ridon (Japan, 8 January 2022), which requires a previously owned DX Zenkai Juran, and as the complete DX Don ZenkaiOh set (5 February 2022), which bundles Enya Ridon together with a repacked DX Zenkai Juran. A cheaper Mini-Pla model-kit version (Premium Bandai line) also exists. The mecha was released in Japan only; since neither Donbrothers nor Zenkaiger was ever adapted into Power Rangers, no corresponding Power Rangers toy was ever produced.