Walker, Texas Ranger - Season 7 Episode 18 -

A crime lord named Caleb Hooks, whom Walker helped put in prison several years ago, escapes from prison, hell bent on revenge against the Texas Rangers (because Hooks' brother had been shot and killed during a shootout, and he claims it was murder). Hooks initiates his plan by having Alex and Trivette kidnapped, then placed in a huge tank full of freezing, running water. Hooks then contacts Walker and begins playing cryptic games with Walker, in hopes of both luring his sworn enemy into a death trap of his own and stalling Walker in his efforts to rescue his friends ...