Suggestions by @axiomman

Ben Whishaw

as Jack in Dot and the Kangaroo

Mackinnon and Saunders

as Puppet Fabrication in Dot and the Kangaroo

Tim Minchin

as Lyricist in Dot and the Kangaroo

Tom Kenny

as The Maned Duck in Dot and the Kangaroo

Ben Mendelsohn

as Sorrel in Dot and the Kangaroo

Guillermo del Toro

as Director in Dot and the Kangaroo

Travis Knight

as Director in Dot and the Kangaroo

Guillermo del Toro

as Producer in Dot and the Kangaroo

Barry Humphries

as Morris in Dot and the Kangaroo

Brian Blessed

as Morris in Dot and the Kangaroo

Jemaine Clement

as Dacelo in Dot and the Kangaroo

Tim Minchin

as Willy in Dot and the Kangaroo

Alisha Weir

as Dot Pedley in Dot and the Kangaroo

Patrick McHale

as Writer in Dot and the Kangaroo

Olivia Colman

as Mrs. Platypus in Dot and the Kangaroo

Ewan McGregor

as Mr Platypus in Dot and the Kangaroo

Nicole Kidman

as Elisa Pedley in Dot and the Kangaroo

Hugh Jackman

as Frank Pedley in Dot and the Kangaroo

ShadowMachine

as Animation Studio in Dot and the Kangaroo

Alexandre Desplat

as Composer in Dot and the Kangaroo