G.I. Joe: A Real American Hero (1983)

S2E24 Nightmare Assault

The Joes are plagued by terrifying nightmares featuring a giant snake that assaults them. Initially, they chalk it up to the pressure of their current predicament. However, as these unsettling dreams persist, their performance against Cobra starts to suffer. It soon becomes clear that Cobra is manipulating their dreams to weaken them, using the nightmares as a tactic to undermine the Joes' effectiveness in battle.