Brock Lesnar reportedly has "nuclear heat" in the WWE stemming from his much publicised appearance at the UFC 146 pay-per-view. Vince McMahon had no advanced knowledge that Lesnar was planning to visit the event and speak with UFC President Dana White and it was a surprise to everyone in the WWE when he turned up at the show. Even before UFC 146, Lesnar had been a pain in the ass for McMahon to deal with behind-the-scenes, which all started at the WWE Extreme Rules pay-per-view backstage after John Cena cut a promo to the crowd instead of being stretched to the back after a Lesnar beating, as scripted. In truth, Lesnar was always difficult to work with on his first run ten years ago but with him making far more money and working less dates, he's almost impossible to work with now. He still hates wrestling and prefers real, competitive sports and McMahon fears at any minute he will run back to UFC for a few big payday fights. WWE have since made no mention of Lesnar on WWE Television but have taken a few not so subtle shots where they could. Big Show's promo where he said he was a "fighter, not a sports entertainer" was directed at Lesnar, as was Triple H's taped promo on RAW where he was told not to wear an arm brace selling the Lesnar attack. They have also dropped plans for Paul Heyman to make appearances for Lesnar in his absence and he's expected to be off the radar now until his planned match with Triple H at August's WWE SummerSlam. After his match with HHH, Lesnar will likely not be seen on WWE screens for the rest of 2012. He has a strict limited dates contract and WWE will run out of appearances for him if he were to wrestle at November's WWE Survivor Series and possibly even WWE Royal Rumble in January. WWE see his WrestleMania 29 build up appearances and culminating match with The Undertaker is the most important thing in his contract and are desperate not to jeopardize that.