The Mirror's Reflection / Chained to Your Side

S4 E2: Danny accidentally punches a hole into another dimension (while trying to contact the Bravest Warriors' parents) and lets through an alternate reality group of Bravest Warriors intent on securing this world for their alien masters. / When Beth is stood up by her new beau at the yearly Martian 'Sadie Hawkins day'-style carnival trials, she decides to compete solo against the other couples, including the Bravest Warriors.