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The headmaster Mr Finch (Anthony Head) escorts journalist, Sarah Jane Smith who has been assigned to write a profile on him, around Deffry Vale School and explains that one of the policy changes he has brought to the school are free- but compulsory - school dinners. When Finch and Sarah Jane reach the staff room, the Doctor recognises his former travelling companion but Sarah Jane, who does not recognise the Doctor's new guise, remarks that she once knew another "John Smith".

In the kitchen, the head cook Mrs Jackson (Caroline Berry) warns gloves and face-wearing staff not to spill a drop of the oil which is brought in in a large barrel. While Sarah Jane is trying to break into Finch's office she enters a store room and to her shock sees the TARDIS standing there. When John Smith calls her Sarah Jane she realises he really is the Doctor. They hear a piercing scream and find Rose who is immediately jealous when the Doctor explains who Sarah Jane is. Mickey welcomes the Doctor to every man's worst nightmare, "the missus and the ex". But there is much, much worse to come.