Mike returns to Terra Venture and searches for a new role to fight against the Skelekron monster.

A rescue team led by Mike follows a distress call to an abandoned space ship. There they find a spider monster who captures most of the crew. Mike and Leo free the team, and retrieve a mysterious book, just before the ship explodes.

Holding High Commander Renier hostage, Trakeena demands that Terra Venture send her a mechanic to fix the Scorpion Stinger. Damon volunteers, and while he works on the engine, Leo sneaks in and frees the Commander.

The Guardian arrives on Terra Venture, to get the Galaxy Book back. Deviot interferes, and the Guardian is killed, passing on the role of guardian to Kai. Deviot gets the book, and transports Terra Venture into the lost galaxy.

Terra Venture is greeted in the Lost Galaxy by Captain Mutiny, who the Rangers discover runs a slave camp, and is looking to add the colony's citizens to his work force. Mutiny unleashes the Grunchor monster on Terra Venture, which burrows underground.

Terra Venture discovers a lush green planet to colonize as Trakeena merges with Deviot to become stronger than ever.

Trapped on a desolate Moon in the ruins of Terra Venture, Leo faces Trakeena all alone.