"The Ogg Couple"
Still trying to get enough dowry to marry Olga, Egghead helps her steal the Egg of Ogg and the Bul-Bul Silver Scimitar from a museum. They then steal a royal gift of dehydrated caviar from the National Bank, but Batgirl catches Egghead before he can get away on his mule. (Only Cossack warriors are allowed to ride horses, Olga tells him.) Batgirl convinces Egghead to lead her to their hideout by threatening to let the bank security guard kill him if he doesn't comply.
After rescuing Batgirl from drowning in a vat of caviar, Batman pulls a brush from his utility belt and starts cleaning off her costume.