"He That Believeth in Me" is the first episode in the fourth season of the reimagined science fiction television series Battlestar Galactica. The episode aired on SCI FI and Space in the United States and Canada respectively on April 4, 2008, and aired on Sky1 in the United Kingdom on April 15, along with the following episode "Six of One". The episode's title is a reference to the Book of John, chapter 11:25-26 in the New Testament of the Bible, which quotes; "Jesus said unto her, I am the resurrection, and the life: he that believeth in me, though he were dead, yet shall he live..." The episode was generally well received and also won an Emmy Award.

Following the events in "Crossroads, Part 2", the fleet arrives in the Ionian Nebula to find a clue that will lead to Earth, only to find that the entire rag-tag fleet had mysteriously powered down and is hopelessly surrounded by Cylons. Lee Adama also encounters Kara Thrace, who was thought to have been killed in "Maelstrom" and claims to know where Earth is. The episode also deals with the aftermath of the identity of four of the five final Cylons, Samuel Anders, Tory Foster, Saul Tigh, and Galen Tyrol. The survivor count shown in the title sequence is 39,698.

He That Believeth in Me

Plot

The episode opens where “Crossroads, Part 2” left off, with Lee Adama (Jamie Bamber) flying alongside Kara Thrace (Katee Sackhoff). Lee, still in disbelief, tells Kara he saw her die. Kara brushes this off as nonsense and begins telling Lee about how she has found Earth. The entire conversation is transmitted over wireless to Galactica, where Adama, Roslin, Helo, and the other bridge officers speculate that the resurrected Kara could be some sort of Cylon trick.

He That Believeth in Me

Meanwhile, the Cylon raiders are closing in on Galactica. Aided by Kara and Lee, the Viper force engage the Cylons. Though many of the raiders are destroyed, others break through and begin attacking the civilian fleet. They destroy one civilian ship and damage several others, killing at least 600 people in the process.

He That Believeth in Me

As the Cylons launch missiles at the civilian ships, Adama orders his gun batteries to stop defending Galactica and instead only target missiles headed toward the fleet. He then orders Tigh to launch every fighter the fleet has. Tigh, succumbing to his Cylon programming, pulls out his gun & shoots Adama, and then collapses into despair from what he has done— he then notices that Adama is still yelling orders at him, and realizes that he had just been hallucinating. He proceeds to carry out Adama’s orders.

Elsewhere, Anders is in his Viper, launching into space. He attempts to attack the Cylon ships, but finds himself too distracted by the knowledge that he himself is a Cylon. But when one of the raiders scans his ship ahead of attacking him, Anders’s iris glows, sending some sort of signal to the raider. The Cylons suddenly stop attacking— the raiders return to their base ships, which jump away without causing any further damage to the humans.

Gaius Baltar (James Callis) is taken to a monotheistic cult which has erected a shrine to him. One of the members, Jeanne (Keegan Connor Tracy), believes he can save her dying son. Though reluctant at first, Baltar prays and asks "the one true god" to take his life instead, as he caused the genocide of the twelve colonies and the child is innocent. The next day he is escorted to a bathroom to shave. Charlie Connor (Ryan Robbins), whose son was killed on New Caprica, plans to kill him. Instead of begging for his life, Baltar begs Connor to kill him. His escort breaks free and brutally attacks the captors. After the two return to the cult, Baltar is astonished to find Jeanne's son has been miraculously cured.

Starbuck returns with a seemingly brand new (Mk II) Viper. She doesn't recall being killed and believes she was only gone for six hours. President Roslin (Mary McDonnell) believes Starbuck is a Cylon, despite her having been cleared by the Cylon detector. Starbuck claims to know the location of Earth and insists that following the clue from the Eye of Jupiter is a mistake. With each FTL jump, her sense of Earth's location fades a bit more, after experiencing a short headache. Her attempts to convince Roslin fail. After another jump and headache, desperate to stop Roslin before her feeling fades forever, she subdues the Marines guarding Adama's quarters and holds Roslin at gunpoint.