It is unknown when Mr. Tidwell became infested, but it was apparently sometime after the loss of his wife. At first, Mr.Tidwell was a controller like any other, enslaved by Illim. But over time, Illim became sensitive to his host's cries and anguish. They became friends, and joined the Yeerk Peace Movement, a group of controllers seeking peaceful cooperation with the Yeerks, rather than slavery. At that point, whenever Illim leaves him, he feels empty.
Mr. Tidwell encounters the Animorphs at the dance they attend, and he helps them escape the attention of Chapman when Ax becomes ill and unable to keep himself in his human morph. Mr. Tidwell takes the group aside so that he can speak to Cassie and pass along a message from Aftran, who has been taken captive at the yeerk pool as a traitor. When the other Animorphs fall ill one by one, Cassie alone is left to rescue Aftran. She morphs Illim and enters the Yeerk Pool inside Mr.Tidwell, who hides Illim in a plastic bag in his pocket.
It is unknown what happened to Mr. Tidwell after the war, only that the Animorphs lost contact with him and the rest of the YPM during the final phase of the war.
Appearance in the TV seriesEdit
In the TV series, Mr. Tidwell aids Tom in an attempt to escape into the mountains and starve his Yeerk out. Unfortunately, the Yeerks find out where they are hiding, and take Tom back before the Yeerk dies.