The Scrin walker is an unidentified walker design used by the Scrin species.
These vehicles appeared as roughly smooth humanoid shaped silvery machines with spike-like legs and two long arms. Their heads were roundish in shape and suspended on a long curved neck and was capable of firing energy blasts. This type of walker is capable of walking on all fours or on two of those limbs.
During GDI's investigation of the Scrin's last Threshold Tower, the device activated allowing for the aliens to begin an invasion of the Earth once more. As part of the invasion forces, two such walkers later attacked the Mobius Research Station where they destroyed both it and a Orca but a GDI Dropship carrying Ricardo Vega managed to escape.
Behind the scenes[]
The walker appear in the the first mission outro of the now cancelled FPS game Tiberium.
Tiberium 
Mechanized walkers 