U is for United Planets Cruiser C-57D

The United Planets Cruiser C-57D is a saucer-shaped starship. A smaller dome under the main saucer houses the starship's faster-than-light drive engine and central gyroscopic landing pedestal. On landing, the saucer's gangway and two conveyor-loading ramps swing down at an angle from the underside hull, near the edge of the lower lens shape.

Forbidden Planet is a 1956 American film, and is said to be the first SF film in which humans are depicted travelling in a starship of their own creation. The film has been cited as one of the inspirations behind 'Star Trek' - indeed, C-57D inspired the look of the saucer section and interior design of the USS Enterprise.