Batman - 4yrs old. My son is a HUGE batman fan.  First the music - I made a custom CD is about 45 minutes of childrens song - every third song was the Batman theme song.  Make a list of the songs order so you can get to the one you need quickly. Prior to the party I created a Batcave cut out (all material including paint, plywood and black backdrop $30)I had a young lady come over before the party really got started to help paint Batman stuff of the kids faces.  When she was done I used the Batcave as a photo op to get the kids pictures done (I included the picture with the thank you notes)First we played Batman-Batman joker (Duck duck goose), next we played Bat-Tag (using bat clip art and craft foam I made bat - used double sided sticky tape to stick to the kids shirts) who ever got the most bats in 2 minutes won (we played this one twice). Next we played - Penquin shuffle (3 teams - 5 kids each) balloons between the legs they had to run to the batcave. The team member could run until the previous person was through the cave. (I even got the moms to do it. Last we played - Mr Freeze dance (using the batman theme song). Food:  Poison Ivy Punch (froze silk ice in green koolaid - floated them in red punch).  Riddler Munch - green MM, yogart raisins, peanuts.  Joker Jello Jigglers.  And of course the cake - homemade looked like the yellow batman insigna.  Goodie Bags - simple - plastic batman tumbler cup, batman curly straw and a chocolate bar with custom Batman wrapper. Kids has a blast!