Digimon Frontier

The gang turned into their human-fusion spirits to go after Lucemon but he defeats them all, thus returning the friends into their human form again. With Lucemon about to destroy Takuya, Zoe, J.P. Tommy and Koji once and for all, Lowemon steps in to stop the attack. Lowemon let the darkness and the light flow into one and surround him. When it was all over, Koichi gave his human and beast spirit to Koji and afterwards, Koji and Takuya transformed as one into the ancient Digimon, Susanomon.