Godzilla's Counterattack

Godzilla's Counterattack (ゴジラの逆襲 Gojira no Gyakushū) is an unmade 1991 Heisei era Godzilla film.

Plot
A group of terrorists implant a device inside of Godzilla that triggers an unstable nuclear reaction inside his body, turning him into the unstable Red Godzilla, which begins a rampage across Japan. The JSDF (Japanese Self-Defense Forces) then enacts a desperate plan to inject a team of scientists inside of Godzilla to bring him under control while the giant robot Mechani-Kong battles him from the outside.

Next unmade film
Micro Universe in Godzilla