1. Sean Connery as the Green Knight in Sword of the Valiant 

The Green Knight Arthurian Film

He’s green, he’s sparkly, he can attach his own head and in this barely recognisable bastardised version of Gawain and the Green Knight, he has NOTHING to do with Bertilak. But he IS Sean Connery, and he IS green and sparkly.

2. Sinead Cusack as an Evil Nun in Camelot

evil nun

She’s fabulous, but she’s evil.

3. Joan Allen as Evil Morgause in the Mists of Avalon 

Arthurian TV film

see above.

Please suggest any I’ve missed!