Cassie Lang
| Real Name: | Cassandra Lang |
| Birth Year: | 2007 |
| First Appearance: | Ant-Man |
| Team Affiliation(s): | Brookemont Elementary |
| Race: | Human |
| From: | San Francisco, CA |
| Height: | 5'9" |
| Weight: | 128 lbs. |
Cassie Lang was born to Maggie and Scott Lang on July 20, 2007. Her father was a petty thief who vowed to quit his life of crime when his daughter was born; however, he was arrested after breaking into the house of the head of Vistacorp and sending back money the company had stolen from its customers. Cassie's parents divorced while Scott was still in prison and Maggie soon became engaged to Jim Paxton, who raised Cassie like his own daughter.
Cassie Lang loves her father, Scott Lang, knowing he is a good man at heart; this bond between them is quite strong as despite three years apart, Cassie still loves and wants to be around her father.