The Witch of Plated City - Part 1 - S1.E34

The 999 arrives on a planet where everything is plated in gold, the streets, the buildings, even the people. A thief knocks Tetsuro out and steals Maetel's luggage. Tetsuro runs after him into the sewers where he discovers the thief, a teenage boy named Hoilock, is not gold after all.