Unfinished Business - S4.E22

Anubias kidnaps Noah in order to get Dan to battle him in one last showdown. After being informed of this Dan arrives for the battle and Noah (freed after serving his purpose) and Shun observe the battle. Anubias tries many ways to gain the upperhand including using three Bakugan at once and later combining two of his own through mutation. He briefly gains an advantage due to the mutations but Dan regains control after summing Zenthon. As the battle reaches its climax, Mag Mel appears and takes Anubias' power, disintegrating him in the process. As Dan and Noah mourn Anubias' loss, Mag Mel is now much stronger and more powerful than ever.