Klov Dreb Fotch Passameer-Day Slitheen was a child from the Passameer-Day Slitheen family.
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His mother said he was a late developer, his parents had him microchipped so they could track him. He stowawayed aboard The Doctor's TARDIS looking for adventure. He stole Cheese Sandwiches, Chips and Chocolate Biscuits in the Tardis for three weeks. The Moxx of Balhoon alerted the Doctor and Martha Jones that the Slitheen accused the Doctor of abducting their child. He tracked Klov to the Tardis, hiding under a floor panel in the console room. The Doctor took him back to his home, but not before stopping by the planet Morbel, an Ocean planet with the biggest log flume in the galaxy. (WC: Who Ate All the Biscuits?)