Harold Lillja [1] is a scientist and colleague of Donatello.


Teenage Mutant Ninja Turtles

For further information, see the Turtlepedia article for Harold Lillja.

Donatello, April O'Neil, and Harold teamed up to construct their own Interspatial Teleportation Unit from the Fugitoid's schematics. Donatello gathered everyone to test the teleporter and go to The Lair. Annoyed with Raphael's question about bugs in the system, Harold stated those were overcome by his genius. When Donatello countered it wasn't that easy, Harold declared a demonstration was in order. He threw an apple into the portal. It was teleported elsewhere in the lab and hit Casey Jones in the back of the head. Harold punched in the coordinates to the Turtles' lair and generated a portal. A fly buzzing around began to irritate Harold. As they all went through the portal, Harold accidentally hit a switch marked "Spatial Dimension Do Not Touch." The Turtles, April, and Casey were transported to another dimension.


  • In the Teenage Mutant Ninja Turtles' IDW canon, Harold and Donatello used to be enemies on the Internet.


IDW Comics

  • Teenage Mutant Ninja Turtles Ghostbusters


  1. Dramatis Personae (2014). IDW Comics- "Teenage Mutant Ninja Turtles/Ghostbusters Issue #1" (2014) (Comic p.ii).


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