The Suburbia Affair - S3.E17

Dr. Rutter, after inventing antimatter, hides out in Suburbia under the name Willoughby because he fears his creation will be used destructively. Solo and Illya take a house there to find him. But THRUSH agent Miss Witherspoon also wants to find Rutter, and when Rutter sends his neighbor Betsy after some rare medicine from the pharmacist, Fletcher, the chase is literally on the find Rutter first.