When Yang gets the all-powerful "I'm with Doofus" T-shirt, he finally finishes his Woo Foo suit of armor. The four floating Elder Heads tell him he needs to put the armor in a sack and throw it into the Night Master's den fireplace at midnight. To do this, Yang signs Yin up for a party club, which means she would host a party that night. Yang convinces her to host it at the Night Master's lair. During the party, Yang sneaks into the den, but when he throws the sack into the fire, Eradicus bursts out. Turns out, the Elders are Eradicus' Minions! Eradicus starts the Dark Tomorrow, which makes everything backwards. When Yin and Yang make it out, they kidnap Master Yo, and then both Yin and Master Yo lose Yang's trust after Yin gets kidnapped by evil friends to minions. Yang runs into the League of Evil (now the League of Goody Two-Shoes) and gets armor. Yang goes to fight Eradicus without any help or trust from Yin or Master Yo.