• Kirk Van Houten as Thomas
  • The Sea Captain as Edward
  • Luigi Risotto as Henry
  • Dr. Hibbert as Gordon
  • Mr. Burns as James
  • Chef Wiggium as Percy
  • Old Gil as Toby
  • John as Duck
  • Legs as Donald
  • Louie as Douglas
  • Bart as Oliver
  • Moe as Diesel
  • Greg (from American Dad) as Bill
  • Terry (from American Dad) as Ben
  • Principal Skinner as BoCo
  • Brandine as Daisy
  • Mona as Mavis
  • Mr. Smithers as Stepney
  • Agnes Skinner as Emily
  • Database as Bertie
  • Ned Flanders as Salty
  • Jasper as Harvey
  • Superintendent Chalmers as Arry
  • Frank Grimes Jr. as Bert
  • Eddie as Fergus
  • Stewiacke (from Theodore Tugboat) as Skarloey
  • Boomer (from TUGS) as Rheneas
  • The Fire Tug (from TUGS) as Sir Handel
  • Izzy Gnomez (from TUGS) as Peter Sam
  • Fundy (from Theodore Tugboat) as Rusty
  • Zorran (from TUGS) as Duncan
  • Sea Rouge's Uncle (from TUGS) as Duke
  • Sea Rouge (from TUGS) as Freddie

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