It's Portal Day and Lex is on a mission to return everyone to their rightful time periods, but when a surprised Lena panics and uses her timepiece, she must rewind time if she has any hope of keeping her secret from her classmates. Meanwhile Henri is feeling totally left out as Lena focuses on an injured Max. When he sees her deliberately ignore his call, he reacts and storms through the now open portal to 1905. He quickly regrets this choice, but it's too late as Lex has already locked the portal.