Fan Casting Darren Cross in Ant-Man and the Wasp

Darren is a the owner of Cross Technology, a rival company of Pym Tech, and he's the one who steals the Pym Particle. He sends most of the sample over to one of his contacts at HYDRA, but he saves some of the sample for his partner, Elihas Starr, who makes him a replica Ant-Man suit, which he calls the Yellowjacket.