The True Spider-Man voice cast
I just spoke with Scott Trowbridge on facebook and he told me that
Chris Edgerly plays- J. Jonah Jameson,Pete Parker/Spider-man
Rodger Bumpass plays- Dr. Octopus
Jim Wise plays- Electro
Pat Fraley plays- Hobgoblin
Candi Milo plays- Scream
He Does know who played the voice of Hydro-Man
but this information is 100% true.