Marvel Thor: Ragnarok Hulk Retro Grayscale T-Shirt Friends that fight together, stay together! And friends that wear the Thor: Ragnarok Hulk Retro Grayscale Black T-Shirt stay fashionable! This awesome grayscale print shows off Thor and Hulk in the gladiator ring, while cool multi-colored shapes adds a pop of flare to this fun Ragnarok shirt. 100% Cotton.