Ghost of a flea

Spider-Man was the first series in which the hero uses a giant robot to defeat giant monsters. After Spider-Man beats up on the human sized monsters they turn into giants. Spider-Man then calls Marveller to fire missles at the monster and then transform into the giant robot "Leopardon". Leopardon uses various weapons to kill the monster. This concept proved so pupular that Toei added it there third Sentai series "Battle Fever J", which was originally planned to be "Captain Japan", based on Marvel's "Captain America".