Sir Ian McKellen and Andy Serkis, who gained international fame as Gandalf and Gollum in the Lord of the Rings movies, are reuniting for a trip into the London sewer system, and Hugh Jackman may join them. McKellen and Serkis are lending their voices to Flushed Away, a DreamWorks cartoon comedy that centers on a pampered British rat who accidentally gets flushed from his posh penthouse flat into the slimy London sewers. DreamWorks is partnered on the project with stop-motion animation powerhouse Aardman Animation, the British studio behind Wallace and Gromit. McKellen voices the story's antagonist, a villainous frog, while Serkis plays his hench-rat, Spike. Jackman is in early negotiations to play Roddy, the pampered rat. Serkis is providing voice and body for the title character in Lord of the Rings director Peter Jackson's King Kong, in which he will also play Lumpy the Cook. McKellen will be lending his voice in two upcoming movies, Eighteen and The Magic Roundabout Movie. Jackman, who worked with McKellen in the X-Men movies, lent his voice to the straight-to-DVD animated Van Helsing prequel Van Helsing: The London Assignment.