Dr. Who's Matt Smith was stateside in Los Angeles to participate in an event called "24 Hour Plays". Its a pretty interesting charity concept, where actors get on stage and perform plays written the night before. Smith performed in a play titled, Gotham Autopsy, where he is the Caped Crusader. According to the UK newspaper, The Telegraph:
At the start of his play – called Gotham Autopsy – Smith was covered in a sheet in a mortuary before he came to life as a confused Batman. Comedian and Don't Mess With Zohan star Nick Swardson starred as Robin. Also in his play were Kick Ass star Lyndsy Fonseca and fellow Brit Saffron Burrows. Half-way through the 20 minute skit Smith dropped his fake American accent and became a cockney (Brit) to huge laughs from the audience.
Also, performing in seperate plays were Eva Mendes (Ghost Rider, The Spirit) and Ian Gruffudd (Mr. Fantastic in Fantastic Four). The shows are once in a lifetime events, never performed twice and never recorded.