Cast[]
- Ardal O'Hanlon/James Dreyfus as George Sunday AKA "Thermoman"
- Emily Joyce as Janet Dawkins
- Lill Roughley as Ella Dawkins
- Tim Wylton as Stanley Dawkins
- Lou Hirsch as Arnie Kowalski
- Hugh Dennis as Dr. Piers Crispin
- Geraldine McNulty as Mrs. Raven
- Philip Whitchurch as Tyler
- Moya Brady as Avril (Series 1)
- Pat Kelman as the Ultron Postie (Series 3–6)
- Finlay Stroud as Apollo "Ollie" Sunday (Series 2–6)
- Madeline Mortimer as Cassandra "Cassie" Sunday (series 5–6)
