Igor/Planet 51

Dr. Holzuwurm's Igor as Captain Charles T. Baker

Blind Woman as Neera

Igor as Lem

Dr. Schadenfreude's Igor as General Grawl

Puffa (from TUGS) as Newsreels

Dr. Holzuwurm as Rover

Scamper as Skiff

Bluenose (from TUGS) as Prefessor Kipple

Porky Pig (from Looney Tunes) as Eckle

Dr. Herzschlag as Lem's Dad

Sigrid (from TT) as Lem's Mom

Homer (from The Simpsons) as Lem's Father

Marge (from The Simpsons) as Lem's Mother

Shrimpers (from TUGS) as The Army Soldiers

The Pirates (TUGS), Royal Guard 2, Dr. Schadenfreude, Cabot (TT), Dr. Glickenstein, and Jaclyn as The Doctor

Izzy Gomez (TUGS), Budgie (Budgie the Little Helicopter), The Goods Engine (TUGS), Theodore (TT), and Hank (TT) as Smellman

Foduck (from TT) as Glar

Buzz off Man as The Soldiers

George (TT), Blandford (TT), Eva, Kraka-Toa (TUGS), Inverness (TT), Dusty (Planes), Donald Dock (TT), and Digby (TT) as Additional Voices