Adult Swim describes the brief:
Paying homage to the basic story Lone Wolf and Cub, Samurai Rick defends Shogun Morty towards all comers. In half one, we realized that Rick WTM-72 is to not be underestimated. In the finale, his savagery is aware of no restrict! Rick and Morty Samurai and Shogun half 2, directed by Kaichi Satō.
Studio DEEN produced the primary “Samurai & Shogun” animated brief that aired on Toonami and streamed on-line in March 2020. Staff members included director and scriptwriter Kaichi Satō, producer Koji Iijima, and government producer Maki Terashima-Furuta (President of Production I.G. USA). Jason DeMarco, senior vice-president and inventive director for Adult Swim, said in March 2020 his group “spent a year putting together a five minute Rick and Morty Lone Wolf & Cub anime short.”
Adult Swim streamed an eight-minute “Rick and Morty vs. Genocider” animated brief in July 2020.
Source: Adult Swim‘s YouTube channel