Suggested by Destroyer Battra is a tough Kaiju but Doc Samson is someone who has taken on the Hulk and even come out ahead. He would be able to completely overwhelm Battra and is quick enough to dodge the counter shots. Marvel heroes are no strangers to fighting giant monsters and this would just be another beast in a long line of defeated creatures. You would need a more powerful Kaiju to stop this guy. Doc Samson wins.