Time Worm

You may be looking for Timewyrm or Crinis.

William once wrote a letter to Doctor Who Adventures, asking the Eleventh Doctor if the Time Beetle had a friend, such as a Time Worm or a Time Spider, as well as if he liked them.

The Doctor responded that the Time Beetle belonged to the Pantheon of Discord, speculating that they "probably" had Time Worms, Space Parrots, and Dimension-Jumping Cheese Weasels, as they "just love[d] chaos". (PROSE: "Time for Friends!" ^[+]Part of Doctor, Doctor! 273, Loading...{"page":"29","namedpart":"Time for Friends!","1":"Doctor, Doctor! (DWA 273 short story)"}) Notably, the Seventh Doctor had previously faced a godlike being known as the Timewyrm. (PROSE: Timewyrm: Genesys ^[+]Loading...["Timewyrm: Genesys (novel)"], etc.)

Behind the scenes

In addition to the name's similarity to that of the godlike Timewyrm, the phrase "Time Worm" would go on to be used in behind-the-scenes documentation as an informal descriptor for the Crinis of The Twelfth Doctor Interactive Story, with David Wilson-Nunn, a creative lead on the project, stating that the Crinis were created in response to the brief of "creating a 'time worm' style monster".