Fireball is a minor character introduced in the perennial 1964 Christmas television special Rudolph the Red-Nosed Reindeer who plays an important role in one key scene.
Fireball is a young buck with a distinctive shock of blond hair who befriends shy Rudolph at the 'Reindeer Games', the annual contest where Santa Claus evaluates the flight skills of his youngest reindeer. It is Fireball who encourages Rudolph to meet Clarice a young doe who has developed a crush on Rudolph. Clarice informs Rudolph that she finds him cute. Inspired by Clarice's affection, Rudolph impresses all the reindeer assembled with his flying ability. A playful scuffle with Fireball ensues and the rubber cap Rudolph has been wearing to hide his glowing nose comes loose. Fireball is the first to witness Rudolph's true appearance and is terrified by the sight.
Fireball does not appear to be among the reindeer who mock Rudolph either at the Reindeer Games or in a later scene when Rudolph returns to Christmastown.