The Alexandra does lovely pub food - only watch out would be that the dining area is linked to the main bar which can get a bit rowdy if there's sport on TV.
Other option is to hop on the bus up to the village where you can't really go wrong. I like the Fire Stables or Rose & Crown.
You'll need to check dining times though - you may struggle if you're going to an evening show?

Looking for a good pub to bring our overseas visitors to after their first panto experience in Wimbledon. Anyone have a recommendation?