However, he suddenly realizes that if the tub overflows, it will leak out into the hall the bath toys care little if this happens and continue to party. The toys quickly start to sing and dance in a rave-like fashion, aided by a carefree Rex throwing a bubble bath solution into the tub, and blocking the overflow drain with a sponge. Potato Head's insult, he asserts that he is 'Partysaurus Rex,' and helps the bath toys to start a new bath.

Rex initially thinks drawing a new bath is a bad idea, but after recalling Mr. Once alone, the bath toys wish they could continue to have fun, but none of them have arms (except Rex) and can only function if afloat in the water. Rex enjoys being played with the other bath toys, but soon Bonnie's mother comes to turn off the bath and take her out. She takes him to play with while she takes a bath. Potato Head calling him 'Partypooper Rex.' The other toys sense Bonnie approaching, and scatter, leaving Rex alone when she enters. He is chastised by the other toys, with Mr. Rex disrupts the other toys blowing soap bubbles, worried they may ruin Bonnie's house.

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