High Quality Content by WIKIPEDIA articles! "Attack of the Alligators!" is the 23rd episode of the British Supermarionation television series Thunderbirds. One of the last episodes of the first season, it was first broadcast on ATV Midlands on 10 March 1966, was written by Alan Pattillo and directed by David Lane. In this episode, alligators grow to a huge size when their habitat is contaminated by an enlarging chemical. The creatures proceed to threaten innocent people trapped inside a house, stirring International Rescue into action.