Pegasus is a British period television drama series which aired in four parts on BBC 1 in 1969.[1] It is a sequel of the 1968 series Triton which focused on two British naval officers battling a Napoleonic plot to invade Britain with the aid of submarines. In the sequel the two officers return to try and foil a ploy to use hot air balloons to bombard the naval base at Portsmouth at the time of Trafalgar.