Ioan Gruffudd

as Simon

as Nathaniel Clem

as Milk

as Self(1 ep)

as Lockwood

as Angus Doyle(1 ep)

as Thomas Degalais(6 eps)

as Peter

as Henry Bradley

as William Kingsley

as Dr. Daniel Harrow(30 eps)

as Andrew Earlham(12 eps)

as Carl Mitchell

as Self

as Anthony

as John Booth(5 eps)

as Daniel Riddick

as Stuffy

as Henry Morgan(22 eps)

as Mog Edwards

as Thomas Morrow (voice)

as Charles Mundi

as Dr. Stewart Delany(1 ep)

as Self

as Andrew Martin(22 eps)

as Wetwork Man

as Alec

as Carl

as Colin Smith

as Paolo San Pablo(2 eps)

as Eric Vaughn(1 ep)

as Sir Benjamin Merryweather / Sir Wrolf Merryweather

as Armor (voice)(1 ep)

as Prime Minister Tony Blair

as Addison

as Devin Levin / Robot Guard (voice)(1 ep)

as Agent Crush (voice)

as Simon (segment "The Little Things")

as Self

as Self

as Self

as Reed Richards

as Richard McCallister

as William Wilberforce

as Self(1 ep)

as Self

as Self

as Self

as Reed Richards

as Dark Haired Man / Medic (voice)(1 ep)

as (voice)(1 ep)

as Self

as Daniel

as Self

as Mr. Miracle (voice)(1 ep)

as Lancelot

as Host

as Lukas Gold(9 eps)

as Self

as King Bendigeidfran (voice)

as Dan Blakeley

as Commander Horatio Hornblower

as Horatio Hornblower

as Phillip Bosinney(4 eps)

as Harry Silver

as Freddy Guns

as Beales

as Self(1 ep)

as Sgt Max Bracchi

as Frederick Edward Francis Bywaters

as Hob

as Horatio Hornblower

as Horatio Hornblower

as Kevin Shepherd

as Lt. John Feeley

as Lieutenant John Feeley(2 eps)

as Jack(1 ep)

as Solomon Levinsky

as Pip

as Pip(2 eps)

as Horatio Hornblower

as Horatio Hornblower

as Man (voice)(1 ep)

as National Geographic Narrator (voice)(1 ep)

as Prince Charles (voice)(1 ep)

as Horatio Hornblower

as Midshipman Horatio Hornblower

as Horatio Hornblower(8 eps)

as Fifth Officer Lowe

as Self - Winner(1 ep)

as John Gray

as Jeremy Poldark

as Nigel Fraiman

as Self - Guest(1 ep)

as Self(1 ep)