The Most Surreal And Horrifying Transporter Accidents On Star Trek

• Series: Star Trek: The Next Generation
• Episode: Season 6, Episode 4, "Relics"

The Enterprise receives a distress call from the USS Jenolan, a ship that has been missing for seventy-five years. After investigating, the crew finds no survivors, but LaForge notices that the transporters had been reconfigured in a strange manner. Amazingly, a pattern is still in the system's buffer and had suffered no degradation. He rematerializes the stored pattern, beaming Original Series character Montgomery "Scotty" Scott onto the transporter pad.

• Series: Star Trek: The Original Series
• Episode: Season 2, Episode 4, "Mirror, Mirror"

In "Mirror, Mirror," Kirk, McCoy, Uhura, and Scotty are sent to a mirror universe after a transporter accident during an ion storm. In this alternate reality, the Enterprise is a warship for the malevolent Terran Empire. The only way Kirk and crew can return back home is by impersonating their mirror-universe duplicates and outsmarting an evil, goatee-sporting Spock.

• Series: Star Trek: The Next Generation
• Episode: Season 5, Episode 24, "The Next Phase"

A faulty generator causes a transporter failure, leaving the crew of the Enterprise to believe Lt. Comm. LaForge and Ensign Ro were killed. But Geordi and Ro survived; they just beamed into a different phase than everyone else, free to wander the ship, but unseen and unheard by the rest of the crew. They observe their own funeral preparations before purposely causing a disruptor overload, which tips Data off to their whereabouts, allowing him to re-cloak them.

• Film: Star Trek: The Motion Picture

A transporter malfunction results in the horrific deaths of two crew members. Science officer Sonak and another crew member arrive on the transporter platform with their internal organs outside their bodies. The fleshy, disfigured masses didn't survive long.

• Series: Star Trek: Deep Space Nine
• Episode: Season 3, Episode 11 & 12, "Past Tense" 

Sisko, Bashir, and Dax are sent back in time to 2024 San Francisco after a transporter accident. They inadvertently change history by allowing Gabriel Bell, a key figure and activist during a period of rioting, to be killed. It's on them to restore history before they can travel back home.

• Series: Star Trek: The Next Generation
• Episode: Season 6, Episode 24, "Second Chances"

On an away mission, Commander William Riker came face to face with... himself! As it turns out, eight years ago, while serving on the USS Potemkin, a transporter malfunction caused the creation of a duplicate Riker (dubbed Lt. Thomas Riker). Thomas was brought aboard the ship, butted heads with William, and rekindled his relationship with Deanna Troi before ultimately being reassigned to the USS Gandhi where he could continue his Starfleet career.