Samuel L. Jackson is very keen to do a cameo in the new 'Indiana Jones' film, for it may help him stay ahead of Harrison Ford as the world's box office king.

The 'Pulp Fiction' star's appearance in a string of hit movies enabled him to replace Ford as Hollywood's most successful actor.

However, he now fears that the ageing icon may reclaim his crown on the back of the fourth Jones flick. Jackson revealed that movie mogul George Lucas had told him that he had found him a role in the new Jones film, while they were working together on the final 'Star Wars' saga.

"George said, `Well, if you wanna stay in front of Harrison then we've got to figure out a way to get you in Raiders (of The Lost Ark),'" Contactmusic quoted Jackson as saying.

"So now they're shooting Raiders and I've been calling him; he won't return my calls. Can you believe that? He's dogging me. All I want to do is run across screen, I don't have to say anything. I just wanna run through the movie, get my name in the credits, so I can stay in front of Harrison," he added.