Sloan Blackburn is the hidden main antagonist in The Wild Thornberrys Movie. He is voiced by Rupert Everett.
In his only role as a character in the franchise, he was the main villian of 'The Wild Thornberrys Movie' alongside his wife Bree Blackburn. The first we see of Sloan is him dropping from a helicopter and snatching up the Cheetah cub Tally, whom Eliza had been playing with. He cuts the rope latter sending Eliza plummenting to the ground, though we don't actually see his face.
The next time he appears, he pulls up right after Eliza jumps from a train to save a wounded Rhino.