There is one awfully long minute at the beginning of Rick Miller's 10-soliloquys-a-second Macbeth - set in Springfield - when, in the immortal words of Homer Simpson, you think, "Doh! What am I doing here?" A vision briefly passes before you of being locked in the bedroom of the world's most annoying, hyperactive teenager who insists on putting on a play in the voices of his favourite cartoon characters. Somebody get the Ritalin quick!

Thankfully, the feeling passed. Within three minutes you suppress the urge to scream, despite the fact that Moe and Principal Skinner turn up as the witches, when surely Marge's sisters Patty and Selma were born for the parts. Within five I was warming to the idea of combining the TV series that is the unquestioned pinnacle of human artistic achievement with a play by some dead dude, and by the time Ned Flanders turned up as Banquo ("Okallydocallydoo!"), I was laughing like an idiot.

Certainly, Homer as Macbeth is an everyman for ages to come as he utters such immortal lines as, "Is this a dagger I see before me or a pizza? Mmmm...pizza" and "MacHomer shall sleep no more - and I love sleep." The doughnut of destiny has at last found a noble head on which to rest.

Miller's Barney Gumble Macduff surely bears comparison with Olivier's as he avenges Mac Homer's destruction of his family and estates. He even killed Kenny.

It is no wonder fellow Canadian Robert Lepage continues to try and harness this prodigiously gifted and manic mimic. He has his work cut out, for Shakespeare could not contain Miller, who rattled straight into a medley of rock-star impersonations to Queen's Bohemian Rhapsody for 10 minutes after the play finished.

Dr Hibbert should prescribe a nice lie down.

• Till August 28. Box office: 0131-226 2428.