William Overgard was a writer and cartoonist, known for working on Steve Roper and Mike Nomad. William also worked on Silverhawks. He was the writer of the following Thundercats episodes:

10. Mandora – The Evil Chaser

16. The Fireballs of Plun-Darr

23. Mandora and the Pirates

30. Dr. Dometone

36. The Thunder-Cutter

44. Sword in a Hole

85. Side Swipe

100. Exile Isle

108. The Jade Dragon

109. The Circus Train

119. Screw Loose

122. Cracker’s Revenge

126. Swan Song

130. The Book of Omens

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