The theft of the space cruiser Aurora by Doctor Sevrin and his young followers, and their later seizure of the Enterprise, in a doomed search for the mythical paradise planet Eden.
In the Original Series episode The Way to Eden, the Enterprise pursues the stolen cruiser Aurora, which breaks up under the strain; its six passengers are beamed off in time. They are disciples of Doctor Sevrin, a brilliant engineer who rejects technological society. Among them are Tongo Rad, son of the Catullan ambassador, and Irina Galliulin, once close to Chekov.
Sevrin carries a disease deadly to anyone without modern immunisation, which makes his dream of a primitive world a danger to others. While his followers charm the crew with music, they learn how to run the ship from auxiliary control.
They take the Enterprise into Romulan space, stun the crew with ultrasonics and fly a shuttle down to Eden. The planet is beautiful but its plant life is saturated with acid. Adam dies after eating the fruit, and Sevrin deliberately does the same.