Swamp Thing is an elemental creature who shares a connection to all plant life on the planet Earth through a network called the Green. He is a mass of vegetable matter that absorbed the memories and personality of Alec Holland, a botanist who died in a swamp shortly after creating a hormonal Bio-Restorative Formula for plants. He is associated with the Parliament of Trees and the White Lantern Corps.
Swamp Thing is married to Abigail Holland and they are parents to Tefé Holland.