Dexter's Laboratory : Snowdown (1997)
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Synopsis by Emru Townsend
It's winter, and Dexter can't go anywhere without being constantly pummeled by Dee Dee's snowballs. Even his bedroom isn't safe. When he asks his dad to make Dee Dee stop, his father tells him about the days when he was the neighborhood's ultimate snowball champ. Seeking to reclaim his former glory, he trains Dexter in the way of the snowball warrior. (Original air date: September 10, 1997.)