Diff'rent Strokes (1978)

S02E10 Father and Son Day

In his relentless quest to outshine a rival at the gym, Willis makes a choice that backfires spectacularly, causing pain to Mr. Drummond and giving Arnold the chance to gloat with a smug "I told you so." In his acting debut, baseball legend Reggie Jackson plays a pivotal yet unsuspecting part in Willis' misguided plan, adding an unexpected twist to the unfolding drama.