S1·E6 Episode 6

Tired of pushing Else around in her chair, Alf looks into an electric scooter but they cost £2,500 and Social Security informs Alf that, as long as he's able to push, Else is ineligible. Taking an idea from some go-karting kids, Alf adds jet propulsion to the chair, which goes out of control, foiling a bank robbery and landing him in hospital. He's declared a hero but, following Winston's view that the robbers' accomplices may be out to get him, decides to remain anonymous.