Comedian Paul Reubens is terrified about reviving his zany character Pee-wee Herman for a new stage show, fearing he is no longer "relevant" to modern audiences.

The wacky actor is preparing to step back into the spotlight by staging the Pee-wee Herman Show at Music Box theatre in Los Angeles - 19 years after he retired his alter ego.

But he admits he's confronted by his own doubts every day as the project debut draws nearer, telling Details magazine, "I am constantly hoping that I'm still relevant at all... What I'm trying to prove now is that I still have it, I'm still around - I still am Pee-wee Herman, and Pee-wee Herman is still funny."

And Reubens insists he's entirely devoted to making the show a success, adding, "I have no life outside of writing my show right now."