Digimon: Force Three

Digimon: Force Three is a toyline consisting of three Digivices: Hyper, Fusion and Armor, which was exclusively developed by during the Digimon Frontier era, but was eventually discarded and subsequently cancelled. Interestingly enough, the combined form of the three Digivices closely resembles the head of an Agumon.

According to the few available promotional material we currently have, these Digivices worked in conjunction with the Digimon D-Tector Card Game in the West, which would allow the Tamers to explore new areas of the Digital World and increase the power of their teams. In addition, the device allowed battles in the Multiplayer Mode, and its main objective was to acquire the three available worlds to take over control of the Digital World.

Apparently it was even rumored that Force Three could have been adapted to anime at the end of 2003. The story was to be located in the same universe as Digimon Frontier, and there would be 3 protagonists that would share the same Digimon partner:

"Over 100 years after Season 4, a small conflict occurred in the three areas of the Digital World. Over time, the struggles grew and persisted until now. All that is left is chaos and disorder. But there is a glimmer of hope. The leaders of the 3 areas have come from the real world and they've been given all the powers of the Digivice to help them restore peace. They've been given the awesome responsability of defeating the evil Hydemon before he completely destroys the Digital World."

Therefore, it was planned that a new antagonist called Hydemon was going to be introduced in this series that would originally be limited to a toyline, who would have probably been the final enemy of these Digivices.