A new and unique x Mangave plant named ‘；Thunderbird’； characterized by a rounded mound of fleshy, short, fleshy, slightly cupped, gladiate to lanceolate leaves that develop densely concentrated reddish mottling with intense light. The leaves are predominately upwardly pointing in center portion of the plant and outwardly and curving upwardly in the outer portion of plant. The leaves have numerous small, firm marginal teeth and small, sharp, apical mucro. The new plant is suitable for the garden or as a potted plant in the garden or home.
