

The cave people decided to play music before the trio get here. Since many things have not been invented, cave people can invent things a lot. Tyrone invents the "sled" so they can slide down the snow faster than walking. The trio all realize that they need something to get down the hill faster. The valley trio do the same thing while on the way. Tasha and Austin are living in a large cave on a mountain and sing the second verse of Three Cheers for Ugh!. They are waiting for the Valley Cave People. The camera moves away from Uniqua, Pablo, and Tyrone, who are now slowly walking to the mountains, and to the Mountain Cave People. The backyard transforms into a prehistoric, icy land.

The note is from the Mountain Cave People, and it is an invitation to howl at the moon when it is at its highest peak. Uniqua, Pablo, and Tyrone introduce themselves as the Valley Cave People. Then, the two Cave People walk off into the backyard to get ready. So, Sasha invented an "invitation" that depicts Tyrone, Uniqua, Pablo, and themselves howling and placed next to the tree. They decided to invite the Valley Cave People to join their moon howling. They start to sing the song " Three Cheers for Ugh!." After the song, Austin and Tasha planned to invent objects and when the moon rises above the highest peak, they will howl. Tasha and Austin tell the viewer a word known as "ugh", which can mean anything they want it to mean. They introduce themselves to the viewer as the Mountain Cave People. Tasha and Austin are seen in the backyard wearing white rock necklaces. "Ug! It's an ug-cellent Ice Age adventure set to Calypso as Cave People Uniqua, Pablo and Tyrone invent their way to Tasha and Austin's cave for something called 'a party.'" Plot
