Disney, the entertainment industry's most iconic storyteller, just survived its own saga with activist investor Nelson Peltz. One aspect of the fight that stood out was its cast of characters. In what might bring to mind interconnected movie sequels, or standard reality TV fare, the dispute brought out allies and foes, old and new. Tesla (TSLA) CEO Elon Musk threw his support behind the dissenting party, as did hedge fund manager Bill Ackman, a veteran of proxy battles. Meanwhile, JPMorgan (JPM) CEO Jamie Dimon, himself the target of a shareholder campaign a decade ago, backed Iger and the incumbents.