Angelo is always inventing something crazy, or walking on the ceiling (due to him being an alien), and generally misunderstanding various aspects of human behaviour and daily life which leads to various escapades and situations.

Some actors which appeared in the show include: Ron Moody, John Savident, Christopher Ryan, Brian Murphy and Anthony O'Donnell.

In the early planning stages of the series, creators Grant Cathro and Lee Pressman had toyed with the idea of making Angelo somehow a guardian angel towards Mike.

The original two series featured a quirky, whimsical flute-led theme tune on the opening and closing credits, written by Jim Parker.

At around this point, the comedy drama tone of the first two series began to be shifted towards the more fantastical and farcical, with Angelo creating many inventions which typically run out of control, and occasionally summoning up historical figures from the past.

Series 5 would be produced by Tetra Films, and featured a new theme composed by Kim Goody and Alan Coates, which would remain, in several slight variations, for the remainder of the show's run.

In his place, recurring neighbour character Daphne Fawkes-Bentley's niece Mickey (Gemma Gregory) became Angelo's sidekick.