Anti-Matter With Fries

Ace is working in a fast-food restaurant in Perivale when she encounters who she thinks is her friend Barry Groves dressed in a funny chicken costume. She gives "Barry" a box of fries but does not realise this is actually the Ergon scouting Earth in service of the Time Lord Omega. When he gets the fries, Omega complains about the lack of salt. She later tells the Seventh Doctor about this over table tennis in the Cloister Room.