Miss Miller's Big Gamble Alvin & the Chipmunks : Season 4 Episode 6

After the Chipettes rig Miss Miller’s poker game, she takes them to Las Vegas and becomes a compulsive gambler. She is finally cured when another gambler defeats her in a high-stakes game of blackjack, only to return his winnings after she learns her lesson. The other gambler turns out to be David Seville, the Chipmunks' father, in disguise.