Sky History 2 Saturday

Investigating whether hilltop spirits, which some through time have believed to inhabit mountains, could have been extraterrestrials

Experts investigate strange carvings from 8,000 BC and unexplained sightings in the New World, which could suggest there is more to the US's past than written in the history books

Second World War battles are reconstructed using cutting-edge CGI animation, beginning by showing how the aircraft carrier USS Enterprise battled enemy submarines in the Pacific

CGI reconstruction of the Second World War Pacific battle of Midway, and how American aircraft carriers Enterprise, Yorktown and Hornet turned the tide in favour of the Allies

The naval attack on the Solomon Islands, which was the first American invasion of the Second World War, is reconstructed using CGI technology

Items from archaeological digs from the north of Britain, including examples from the Heart of Neolithic Orkney World Heritage Site, Cumbria and the Highlands

Alice Roberts and Matt Williams visit archaeological digs across the country, beginning with a look at the work being carried out in the west of Britain

Archaeological finds across the east of Britain including divers searching the Thames for clues to a 17th-century tragedy and a metal detectorist making the discovery of a lifetime

Space journalist Sarah Cruddas joins Craig to investigate a spectacular mass UFO sighting over the city of Phoenix, Arizona, in 1997

Craig and space journalist Sarah Cruddas turn their attention to reports of alien abductions, focusing on a case from the UK which was reported in in November 1980

A computer generated re-creation of the events of 1944, in which the US Carrier Task Force forged a path through the Pacific to assault enemy bases at Kwajalein and Truk Lagoon

Experts reconstruct the struggle faced by American forces, led by the USS Enterprise, to reclaim the Marianas Islands from enemy forces

Alice Roberts visits archaeological digs in the east of Britain, where finds include new revelations from a 3,000-year-old preserved village in Cambridgeshire

Alice Roberts visits archaeological digs around the UK, starting with the west of Britain, where finds include a Viking camp and ancient gold

Alice Roberts joins archaeologists in the North as they uncover Roman writing tablets, a lost monastery and a rare Bronze Age weapons hoard

Pablo Escobar's Medellin Cartel became the most powerful cocaine trafficker in the world. However, when they went to war with Colombia the cartel tested their limits

How Oakland Hells Angels president Sonny Barger transformed the club into an organised crime syndicate and created a blueprint for outlaw biker clubs to follow.

A Hells Angel proves his loyalty to the gang by leading a mass slaughter of their enemies - but he soon wrestles with his conscience and seeks an exit

Ten of history's most compelling - and somewhat covert - projects that have studied the UFO phenomenon

The top 10 UFO crashes, from an acorn-shaped object found in the woods of rural Pennsylvania, to a mysterious craft that washed ashore in Japan

Alice Roberts visits archaeological digs in the east of Britain, where finds include new revelations from a 3,000-year-old preserved village in Cambridgeshire

Alice Roberts visits archaeological digs around the UK, starting with the west of Britain, where finds include a Viking camp and ancient gold

Second World War battles are reconstructed using cutting-edge CGI animation, beginning by showing how the aircraft carrier USS Enterprise battled enemy submarines in the Pacific

CGI reconstruction of the Second World War Pacific battle of Midway, and how American aircraft carriers Enterprise, Yorktown and Hornet turned the tide in favour of the Allies

The naval attack on the Solomon Islands, which was the first American invasion of the Second World War, is reconstructed using CGI technology

Ten of history's most compelling - and somewhat covert - projects that have studied the UFO phenomenon