Warning: Possible spoilers.
The Fisher King, a 1991 film directed by Terry Gilliam is based on the myth of the same name-a medieval legend that tells the tale of a dying king who through betrayal and tragedy has lost the Holy Grail. Ostensibly the cup Jesus used at the last supper and into which drops of his blood were collected at the crucifixion, it is the only thing that can save him. He knows this but he is powerless to do anything about it, and although it is right in front of him, he can no longer have the ability to recognize it. It takes an innocent fool with unclouded eyes and a compassionate heart to see it and to fill it with the healing water that the Fisher King needs to be restored.
In the film version, Parry (Robin Williams) and Jack (Jeff Bridges) alternately play the fool and the king, each in retreat from his own reality and each the vehicle for the other's redemption. Their lives first intersect when Jack-a shock jock-inadvertently incites a disturbed listener to commit a horrific act of violence that destroys many lives including Parry's. Parry escapes into madness and homelessness, as in a sense does Jack (though his is manifested through alcohol and a parasitic relationship) and they are each lost in a world of guilt that they are powerless to overcome. It will take each to play the fool to the other's king to open each another's eyes to the possibility of redemption and new life.
Other characters are interwoven (Mercedes Ruehl and Amanda Plummer aptly play the love interests) but it is Parry and Jack who are both the redeemed and the redeemer in this tale. There are stops and starts and other theological and social messages that are interwoven throughout, but this is first and foremost a story about healing the wounds of others, and the importance of giving over receiving. Through Parry's redeeming act, Jack is redeemed and through Jack's redeeming act, so is Parry. Unable to heal or even see their own wounds, they clearly see the wounds of the other, and like Christ, they provide the bridge to life. The Holy Grail, visible only through the compassionate eyes of the fool, becomes the cup filled with the water of life from which they both take a drink and are resurrected.