Sao 5 Tubtim Siam

While the plane of Dr. Ford McQueen (Tony Carne), a NASA scientist, is flying into Thai airspace, he encounters a strange phenomenon. The clear weather suddenly turns into a massive tornado. The pilot tries to steer the plane away from the storm's path, but the sudden maneuver causes it to lose control. Dr. Ford stares intently and tries to shout to the pilot that it is merely an illusion, but it is too late. The plane spins out of control and crashes in the middle of a valley. Major newspaper headlines report the crash, presuming there are no survivors.
Director-General Aphichai (Pattana Tohchalee) and Colonel Chet (Ake Akkarametha) summon "Sao 5" (Saturday 5), a secret operations unit consisting of Therd Yodthong (Watcharabul Leesuwan), Diao Somdet (Rangsikorn Phanpheng), Don Thakradan (Arnus Rapanich), Yod Nangphaya (Rapeepat Eakpankul), and Kring Khlongtakian (Pathit Pisitkul). Also summoned are female secret operatives, both Thai and international, including Chonlada (Kawintra Phothijak), Noon Butsakorn (Faroong Yuthithum), Jenny (Rathakorn Sathiraboot), Kratae (Watsaporn Wattanakul), and Yuki (Pariyanuch Asanajinda). They are briefed on a mission to track Dr. Ford's arrival in Thailand because authorities have discovered that he is not dead. Instead, he has gathered a team and armed forces to enter the Elephant Graveyard Forest in search of the "Siam Rubies," legendary gems with hundreds of years of history.
The Pink Ruby was recorded to have once belonged to the Prince of Mueang Nai and was passed down through generations. Currently, it is in the possession of Natasha (Patchuda Phanpipat), Dr. Ford's daughter. Touching the Pink Ruby made Dr. Ford obsessed and led him to discover a certain energy connected to the nuclear equation E=mc². Consequently, Dr. Ford decided to travel to Thailand to track down the remaining Siam Rubies—the Purple Ruby and the Red Ruby—to use them in his experiments. If successful, it would bring him fame equal to Einstein. His son, Stephen (Matthew Deane Chanthavanij), had already arrived ahead of him, accompanied by his trusted subordinate, Abdul Raheem (Yup Khan).
The Purple Ruby was in the possession of Lanna royals for many generations but had been lost for a long time. It wasn't until Dr. Ford's plane crashed in the Elephant Graveyard Forest that he discovered the Purple Ruby was hidden there. It possesses the power to create various illusions, making the Elephant Graveyard Forest as mysterious as the Bermuda Triangle, and claiming the lives of countless people who ventured into it.
The Red Ruby was in the possession of the Devi of Chiang Rung, adorning her crown. When the Chiang Rung dynasty was threatened, they fled to Thailand, bringing the crown with them. The current heir is the family of Marnfah (Chatchadaporn Thananta). However, Marnfah's family was assassinated by their servant, Nan Kham, who wanted to steal the Red Ruby. Fortunately, Marnfah, who was just a child at the time, was saved by her nanny, Bua Chum (Wiyada Umarin). Marnfah grew up in a jungle village, constantly training in martial arts, waiting for the day she could reclaim her Red Ruby.
Natasha flies to Thailand and tries to get close to the Sao 5 group, following her father's plan to recruit Don and Diao. She wants to use Don's clairvoyance and Diao's clairaudience to find the Purple Ruby. Meanwhile, the Red Ruby is currently in the hands of Dr. Wittaya (Athiwat Sanitwong Na Ayutthaya), Dr. Ford's treacherous former assistant, who managed to steal it from Nan Kham. This forces Marnfah to track Dr. Wittaya into the forest to get her ruby back.
Samdong Limpose, or Master Samdong (Nanthapol Kamutvanit), a Tibetan monk working for Dr. Ford, casts black magic on Don, Diao, Butsakorn, and Kratae. However, Don and Diao are protected by the holy power of their Buddhist amulets, making the magic ineffective on them. Butsakorn and Kratae, on the other hand, fall under the spell and join Dr. Ford's side. Don and Diao pretend to be under the spell as well. Dr. Ford continues his search for the Purple Ruby in the Elephant Graveyard Forest. Jenny, Chonlada, and Yuki secretly follow Don, Diao, Butsakorn, and Kratae into the forest but get lost. They encounter the rebel minority forces of General Jang Li (Pipatpol Komaratat) and his nephew, Pao Chang (Thassachai Chana-atthakan). Pao Chang tries to harm Jenny, Chonlada, and Yuki, but Ken (Gun Pakdeevijit), the twin brother of Can the wildman, steps in to save them. Ken guides the women toward the Elephant Graveyard zone, but they cannot cross the border due to the illusionary phenomena. However, the astral projection of Can the wildman guides Undertaker Taem (Krung Srivilai) to meet everyone there, telling Ken to help protect the Purple Ruby. They also run into Marnfah and Bua Chum, who have been tracking Dr. Wittaya's group into the forest.
With Don, Diao, Butsakorn, and Kratae missing and out of contact with headquarters, Therd, Yod, and Kring take on the mission to follow them into the jungle. This leads to a clash with Dr. Wittaya's group, which has now allied with the forces of Suea Son (Rit Luecha) and Godfather In (Oliver Beaver). However, Don and Diao manage to find the Purple Ruby hidden at a pagoda in the middle of the jungle first. Dr. Ford is overjoyed because he now holds two gems: the Pink Ruby and the Purple Ruby. But his joy is short-lived, as Pao Chang manages to steal the Purple Ruby. Meanwhile, Dr. Wittaya captures Natasha and successfully extorts the Pink Ruby from her. Simultaneously, Dr. Wittaya's group attacks General Jang Li's forces and steals the Purple Ruby back.
Don and Diao manage to free Kratae and Butsakorn from the black magic. They all escape and regroup with Therd, Yod, Kring, Jenny, Yuki, Chonlada, and Ken. However, Marnfah sneaks off to steal the Red Ruby first and is captured by Dr. Wittaya. Ken goes after her, rescues her, and brings her back to join the Sao 5 group.
Having acquired all three Siam Rubies, Dr. Wittaya begins his experiment using the equation E=mc². Although it is the equation for a nuclear bomb—the most destructive force on earth—incorporating the three Siam Rubies into the experiment produces the exact opposite effect. The resulting energy grants immortality, restoring youth to those who receive it and turning them into immortals who will never age or die. However, the catastrophic side effect of the experiment is the spread of illusionary phenomena, which would turn Thailand into a cursed land like the Bermuda Triangle, putting countless lives in grave danger.
When the Sao 5 group learns of this, they attempt to stop the experiment from succeeding. But the mission is far from easy. They must face the forces of General Jang Li and Pao Chang, who also want to possess the three Siam Rubies. Furthermore, Suea Son and Godfather In, who were once Dr. Wittaya's allies, are being manipulated and fed false information. But the biggest obstacle causing chaos for Sao 5 is the wicked plot of Stephen and Natasha. Exploiting the inherent goodness of the Sao 5 members, Natasha uses her feminine wiles to seduce, provoke, and sow discord among them. The Sao 5 team begins to fracture and misunderstand one another.
The friendship of Sao 5 must be tested once again. Will they be able to stop the experiment and protect their homeland? In the end, whose hands will these priceless gems fall into? Find the answers in the drama "Sao 5: Tubtim Siam" (Saturday 5: Siam Ruby).