Supergirl based on the characters created by Jerry Siegel and Joe Shuster." "All students aboard the time machine for a one-of-a-kind field trip! In this history class, the heroes learn about the past, up close and personal. After a time-travel mishap, Harley Quinn, Wonder Woman, Supergirl, Batgirl, and company find themselves stranded in prehistory with some not-so-friendly dinosaurs. Can the Super Hero Girls find a way back to the present? And more importantly, how will their actions in the past put the future in jeopardy?.
