After inviting two spacemen to stay for dinner, Shirley and Moe are asked to return with them to their planet Nextoo to cater their sister's rather large wedding.

Chaos erupts when Moe and Shirley invite some visitors from outer space to stay for dinner with the relatives.

Unappreciated and overworked by his selfish family, Ugh, a prehistoric caveboy, escapes his dreary life when he invents a bicycle.