Watch Riverboat (1959) Episode 1 HD Full Free on SolarMovie. Watch Riverboat (1959) tv series online free. Grey Holden wins a river boat in a poker game, which he then pilots, along with his crew, in various...Grey Holden wins a river boat in a poker game, which he then pilots, along with his crew, in various adventures along the Mississippi River. This action series is set in the nineteenth century.