Derek is the less-attractive brother of Eric. He only appears in TUFF Sell and is voiced by Rob Paulsen.

Physical Appearance

Derek is shown to be a fragile-looking and unattractive cat who is wearing the same uniform as Eric but with glasses, a bowtie and a hat.


When Snaptrap bought T.U.F.F, he replaces Kitty's crush Eric with his brother Derek in order to make Kitty feel miserable, as she wore a different outfit to impress him.


  • It is assumed that Derek is Eric's younger brother as D in his name is before E in Eric's name.
  • Derek is shown to like Kitty too.
  • Despite his one time appearance, few Kudley fans have taken a liking to him as he is nothing like his brother.
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