Harold (also known as Harold the Helicopter and Harold with Retractable Pull) is a helicopter who currently resides at the Sodor Search and Rescue Center. His top blades can spin.
- 1992 (stapled on wooden base)
- 1994 (wooden base)
- 1996 (plastic base)
- 2008 (redesigned with magnetic hook)
- 2010 (previous version re-released)
- 2011 (redesigned with new illustrated details, plastic 3D face, visible tail rotor, name on underside)
- 2013 (redesigned with thicker blades, 2D face, unpainted tail rotor, magnet on underside, curved edges)
- 2018 (printed details on exposed wood, more square shape)
- Harold with rechargeable searchlight from Deluxe Eco Rescue Set
- The Harold with magnetic hook was first sold in the Harold's Mail Delivery Set in 2004, and when it got re-issued individually in 2008, it briefly replaced the regular model.