Marvel Comics published these annuals in the United Kingdom between 1985 and 1992.  The annuals contained various reprinted stories, as well as new activities and information.

1985 Annual
Reprint of "Survival Run!", the comic book version of "Exodus".  Also includes a number of Poster Pin-Ups of the ThunderCats with text descriptions and of the Mutants without descriptions.  End papers are a map of Third Earth.

1986 Annual
Within this annual, "Siege in Silver and Stone", "Way Back...When?", and "Jaga's Quest" are reprinted.

1987 Annual
The Origin Annual.

1988 Annual

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1989 Annual
Stories found in this annual include "Past Perils Times Two" and  "ThunderDogs Ho!".  The Chronicles of Thundera, Plun-Darr, and Third Earth are also contained within.

1990 Annual
Contains "The Price of Pride", "The Last ThunderCats", "The Homecoming", and Portrait Pin-Ups of Lion-O, Cheetara, Pumyra, Bengali, Lynx-O, the Wilys, Panthro, Tygra, and Snarf.

1991 Annual
In this volume will be found "Trial by Fire", "The Perils of Puzz-Lar", and Profiles of Lion-O, Cheetara, Wilykit, Wilycat, Tygra, Panthro, Bengali, Lynx-O, and Pumyra.

1992 Annual
This annual has a section detailing who's who on Thundera, and an updated version of the Third Earth Chronicles with a map.  Also reprinted are "The Creatures that Came Before Dawn", "Perils of the Onyx Pyramid", "Footprints", and "Never, and Beyond".  It's also the only place to find out how to make your own mutant pig.  'Nuf said.