Qualactin

Qualactin was the only planet, apart from Bandraginus Five, on which the rare mineral Oolion occurred naturally. With the latter planet's destruction by the Captain, it became the only planet at all with Oolion deposits. (TV: The Pirate Planet)

Qualactin Hypermint extract was a cocktail ingredient which gave drinks the sweet and mystic odours of the dark Qualactin Zones. According to a recipe in The Hitchhiker's Guide to the Galaxy, the Pan Galactic Gargle Blaster included Qualactin Hypermint extract poured over the back of a silver spoon. (NC: The Hitchhiker's Guide to the Galaxy)

Behind the scenes

 * The name of this planet was later referenced in Qualactin Hypermint Extract, an ingredient in the Pan Galactic Gargle Blaster from Douglas Adams' The Hitchhiker's Guide to the Galaxy series. The Pirate Planet was Douglas Adams' first contribution to Doctor Who.