Immortality: Man-Thing is able to regenerate itself by drawing material from the swamp it dwells in, and is virtually immortal. It's porous form is resistant to most physical attacks because it's not entirely solid; a fist or a bullet will usually pass right through it. He is also able to pass through many fences by oozing through the gaps in the chains.
Empathy/Acidic Secretion: As the Man-Thing, Ted's "brain" is no longer centrally located as when he was human: mutated analogs of his brain cells are unevenly distributed throughout the volume of his head and torso. Inhuman in its functions, his "brain" is incapable of reason, thought, or long-term memory. The Man-Thing does have a sensory apparatus, the location and nature of which is unknown, which is able to empathically sense the emotions of other organisms. Unless stimulated by external emotion, the Man-Thing remains inert. Sensing emotion, he will seek out its source, his pace determined by the intensity of the emotion. Mild emotions provoke "curiosity," causing him to draw near and "observe." Violent emotion will provoke him to seek out the source and attack it. He does not possess emotions himself. Violent emotions in others cause him some form of extreme discomfort, which produces a physical reaction on the surface of his body. In response to emotional provocation, his body produces fuming sulfuric acid which can cause severe burns when in contact with the flesh of emoting beings. When the being ceases to radiate emotion, the Man-Thing's body ceases production of acid, and secretes a mild, soapy mucus that tends to neutralize the acid. The Man-Thing will only attack a being that emotionally provokes him.
Ted Sallis was a noted biochemist.
Able to lift at least 2000 pounds but has fought foes as powerful as the Hulk so at times his strength may be able to increase past this.