"Wasn't I clear last time? Unless you're a crossover, you aren't permitted to enter!" This time, it was Mark's turn to smirk at Polly. "I think you're making a mistake - I _am_ a crossover now." Polly gaped. "WHAT? You said it yourself - NOBODY would write a Doctor Who/Battle of the Planets crossover!" Mark grinned and pointed to an entry at the bottom of Polly's clipboard. "Not so. I just appeared in 'Who Force' - with you as a matter of fact!" Polly frowned. "You think that appearing in a This Time Round story counts as a crossover?!? I've got some bad news for you -" "I'm afraid that the bad news is for you - if you look in the Archivist's Notes after the story, you'll see that it was listed as a Crossover. Therefore I already have appeared in a DW crossover. Now if you'll excuse me - I'm rather thirsty." As Mark pushed past her, Polly shouted after him, "That's not fair! That whole previous piece was written just so you could get inside in _this_ piece!" Mark just smiled and waved.