The Attack on Titan OAD episodes were available late last year on Funimation prior to its merge with Crunchyroll, but were only available as subtitled.
Crunchyroll announced that it will be bringing all eight Attack on Titan original anime DVD episodes in English dub format to its streaming service beginning on May 8, 2022.
Episodes 4 & 5 are based on the Attack on Titan: No Regrets spin-off manga, and highlight the pasts of Captain Levi and Commander Erwin Smith.
The eight episodes will begin launching on the platform on May 8, and will release weekly until all eight are out.