Energon limpet

Energon leeches are an alien species from the Marvel portion of the Generation 1 continuity family.

Energon leeches are parasitic creatures native to the slime swamps of the planet Hydrus Four. They are presumably more similar to energy leeches than the energy leech.

Fiction

"Another Time & Place"

Wading through the slime swamps of Hydrus Four in search of the cure for Nucleon, Grimlock listed having his energon sucked by leeches among the planet's less endearing features. Another Time & Place