Primeval Guest cast, played by Anton Lesser Episode 4x01: Episode 1 (Jan 1, 2011) Episode 4x02: Episode 2 (Jan 2, 2011) Episode 4x03: Episode 3 (Jan 8, 2011) Episode 4x05: Episode 5 (Jan 22, 2011) Episode 4x06: Episode 6 (Jan 29, 2011)