The Woo Foo Battle Ship first appeared in Voyage to the Center of the Yo where Yin and Yang used it to go into Master Yo after Yuck it then appeared in Moon Over My Yinnie where Yin reprograms it to be her boyfriend it next appeared in The Recline and Fall of Civilization where Yang went inside of Master yo's recliner to prove that there was another civilization in the recliner which he proved by bringing Professor Whackjob back to the surface.

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