Steven becomes depressed when his favorite brand of ice-cream sandwich, Cookie Cat, has been taken off the market. He soon cheers up when the Crystal Gems manage to get a hold of some of the last remaining Cookie Cats, which Steven believes may hold the key to activating his gem.
When a menacing red eye threatens to destroy Beach City, the only thing that could possibly destroy it is a Laser Light Cannon, which once belonged to Steven's mother, Rose Quartz. Thus, Steven enlists the help of his father, Greg, and searches through his storage in order to find the cannon.
Steven learns that the Gems are thousands of years old and decides to make up for all the thousands of birthdays they’ve missed, and things spiral out of control when Steven begins feeling too old for birthdays.