Yes he is unstoppable. You knock him down he gets back up. He can be slowed down but not stopped. His only weakness is being vulnerble to telepathic attacks. He's not going to be stopped by just punching him. It doesn't matter if its the Hulk, Thor, Superman, Wonder Woman or Mighty Mouse.

I am still waiting for the JB Hulk TPB.

As for power levels, and for those that care.  I think the 25 tons "mistake" was made in the second Marvel Handbook.  I think the first one had him about as strong as a clam Hulk.  Let me go check...

Yes; it states, "Doc Samson can lift (press) approximately 70 tons, and Samson's strength is equivalent to the Hulk's when the Hulk is calm."

Numbers aside, this is how he was portrayed when he first appeared in the Hulk (IIRC). However, I no longer own that issue.

Nominated as the best JB punch of all time:

"Always"? You mean, since before the book was even published? Since before I wrote it? Before I drew it? Before you'd ever even heard of the Hulk?

In any case, it's not about how hard Samson struck, tho that is certainly a factor. Most important, tho, is that he caught the Hulk completely off-guard. Who had ever done that before?

JB

Always is a perhaps a little to dramatic, but since I became aware of the feat and joke is a little harsh. I think my Hulk bias is showing through -again. That punch was drawn very well and makes a highly impactive image. It's just the Hulk isn't Superman with an array of powers, he does not have the martial skills of Wonder Woman, he is just strong, and for a lesser (if still powerful) character to beat him (even by surprise) comes hard to me as a big Hulk fan. Logically the idea makes sense, otherwise the Hulk would never suffer defeat and there is no better story than coming through adversity. Doesn't make it easier though.

Next year the Hulk is to return and get payback on those who betrayed him, I hope he tears those Heroes apart.

On another note for those Juggernaut fans, what happens when the Unstoppable meets the Immovable (Blob)?