|Behind the scenes|
After the Yeerks discovered that Animorphs were in fact humans and not Andalite bandits, the Animorphs had to evacuate their families. Walter and Michelle were the first to be told about the war and relocated to the Hork-Bajir valley. He and Michelle were both extremely interested in studying the Ax's and the Hork-Bajirs' physiology.
When the Animorphs decided to begin recruiting disable children, Cassie disclosed the news to her father. Walter was appalled that they were using such children for war, but apparently did not tell the parents, as nobody else confronted Jake about the issue.
- On the Animorphs television series, Walter is named John.