George's father visits. On his way he fixes a lady's vehicle, they exchange addresses. Because of some miscommunication the Jetson family think they got involved while in reality grandpa just baby-sits for someone else.

Grandpa Montague Jetson returns and falls in love with a young teenager named Nova Neutron, unknown to him that her boyfriend Tyco has mistaken him for Mr. Spacely and plans to rob him blind.

The annual father/daughter dance means embarrassment for Judy so she fakes the 48 hour flu. Still Jane promises that this year will not be the disgrace from last year because dad is taking dancing lessons. Using a super sniffer the kids try to find their father to peek at one of his lessons.