The SS Greensleeves was a spaceship.
After escaping the Firemen of Fleengarr, the Eleventh Doctor, Amy and Rory saved the SS Greensleeves from invading space pirates, whilst also dealing with a hypomorph which had fused ice cream into its DNA. Amy and Rory lured the creature away in an escape pod, which resembled an ice cream cone. (COMIC: I Scream)
Behind the scenes[]
The spaceship itself resembles an ice cream van, while the pod looks like an ice cream cone.
The SS Greensleeves is named for "Greensleeves", a jingle commonly played by ice cream vans. (AUDIO: Memory Lane)