Here's one with a Jack cameo !

'Oh my Gallifrey ! I'm Donna ! This is sooo weird ! Oi , one heart ! Oh, you've been naughty'.. the Doctor continued , well , the Doctor in Donna's body.

'Watch it time boy ! Stay out of my thoughts !' Yelled Donna , well the Time Lord with Donna's voice.

' Ohhh, make me !'

'You landed us on a planet that makes us turn into each other !' Donna/ Doctor yelled back.

' Actually' piped up the Doctors voice , ' I did get the coordinates right, but I pressed the wrong button' receiving a glare. From himself , but it was certainly a Donna Noble glare.

'So technically it was your fault alien boy !' Donna's voice snapped.

Jack stood in the doorway of the TARDIS , surveying his friends glaring and arguing with each other. He grinned , he was drinking a cup of coffee from a TARDIS blue mug . He wasn't affected as he didn't step onto the marshy ground on a cliff top , with a storm building up in the sky overhead .

' You don't know what I'm thinking right now ' Jack said mischievously , as he started to close the door. Donna and the Doctor took their chance and raced towards the door, but Jack slammed it as soon as they reached it.

Donna , really the Doctor pounded on the door . LET ME IN HARKNESS! She/ he shouted , . I can read your thoughts as well if I get the chance ! Oh this is weird ! TWO HEARTS !

' TIME BOY , YOU BETTER FIND A WAY OUT OF HERE !' the Doctor shouted in Donna's voice . 'OH FOR RASSILON'S SAKE ! ALL THAT SASS ! GET OUT OF MY HEAD ! '

Jack picked up the sonic screwdriver from the charger , tossing it in the air . He caught it with one hand, and smirked to himself, listening to the continuing mayhem outside. Just for fun, he switched on the scanner with the sonic and doubled over in laughter at the sight of the pair standing outside the door.

'JACK LET US IN !' yelled the Doctors voice.

' Lets see how long it takes them to realise which one has left this behind . It would solve everything.' He thought to himself, chuckling as he heard his friends argue.

For the record, it took two hours . Two hours for the Doctor , in Donna's body too busy yelling at her to tell her to check the suit pocket .

'OH MY GOD ,YOU DUMBO!' Donna's voice shouted. ' YOU FORGOT THE SCREWDRIVER ! I'M GOING TO HAVE TWO HEARTS FOREVER !'

'Better than one , Earth Girl' , Donna retorted in the Doctors voice . I'm going to be you ! Oh , it could be worse .. but brilliant , I'm finally going to be ginger !'