I think Luthor's hypersonic was during the clone arc... (I think it was beginning of the episode Seconds), when we have that scene between Luthor and Superman and Luthor blasts the building, and maddeningly shouts "This is war"

If she had to move heaven and Earth, perhaps come back to haunt Perry and explain the story after they'd killed her, she would do it.

Waking a Miracle by Aria