Time Beetle is a member of the Trickster's Brigade, a group of aliens that serve the Trickster. The Time Beetle, similar to the Trickster himself, feeds on time energy and can cause a victim to change a decision they made in the past, thereby altering history. The change in history is usually very minor, affecting only the person the beetle attaches to, and the universe usually "compensates" for the discrepancy.
When the beetle attaches to Donna in "Turn Left", it prevents her from ever meeting the Doctor, resulting in disaster for Earth. The Doctor, Martha Jones, Sarah Jane Smith, and Torchwood staff Ianto Jones and Gwen Cooper were all killed, the city of London was completely destroyed when the Titanic crashed into Buckingham Palace, Captain Jack Harkness was taken to the Sontaran homeworld, and millions of people died from threats the Doctor would have otherwise prevented. If the alternative future had continued, reality would have been destroyed by Davros. In the alternate timeline, the beetle was attached to the back of the alternate Donna Noble who traveled back in time and set history right. Afterwards, the beetle dies when Donna is restored to the correct timeline.
When the beetle attaches to Donna in "Turn Left", it prevents her from ever meeting the Doctor, resulting in disaster for Earth. The Doctor, Martha Jones, Sarah Jane Smith, and Torchwood staff Ianto Jones and Gwen Cooper were all killed, the city of London was completely destroyed when the Titanic crashed into Buckingham Palace, Captain Jack Harkness was taken to the Sontaran homeworld, and millions of people died from threats the Doctor would have otherwise prevented. If the alternative future had continued, reality would have been destroyed by Davros. In the alternate timeline, the beetle was attached to the back of the alternate Donna Noble who traveled back in time and set history right. Afterwards, the beetle dies when Donna is restored to the correct timeline.
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