Igum devises a plan to go back in time and kill Takeru when he's little, thereby creating a time paradox. The Maskman must stop this plan, while getting to see how Takeru is like when he is a kid.

When a sixth Maskman saves the team from an attack, Takeru investigates to find out why he vanished from their battle with Tube.

The Maskman discover the truth behind why Akira was transformed into the Underground Knight Unas as they fight to get him back from Igum's control.

Igum's teacher guides her to a pond where Lethal Doggler was born to gain its power, only to learn a surprising revelation regarding what lies within.