This movie was along the same lines as Ice Pirates. The human crew gather an alliance of alien spacecraft seemingly taken from every page of science fiction to defeat a common enemy. One is a miniature woman who pilots a tiny fighter, another is a beast-man with a ship that looks like a star destroyer. There is even a Twilight Zone-style flying saucer piloted by 4 bald humanoids who speak in unison (and keep a fifth as a spare). The heroes gather in a cave where these 4 are offered a hot dog and they all chew it at once. This ragtag fleet is destroyed one by one in a space battle with only the humans surviving. Any ideas?

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Sounds like: Battle Beyond the Stars (1980) (http://www.imdb.com/title/tt0080421/)