123Movies. After its sensational success in March 2024, OKTAGON MMA will return to the Hanns-Martin-Schleyer-Halle in Stuttgart one year later, on March 8, 2025! At the last event, around 12,000 fans experienced an unforgettable evening with exciting fights and an electrifying atmosphere that made the arena shake. OKTAGON promises another top-class event in 2025.