The Frankenstein Monster Meets Werewolf By Night

The Frankenstein Monster met the Werewolf By Night (Jack Russell) in Giant-Size Werewolf #2 (October, 1974) by Doug Moench, Don Perlin and Vince Colletta (and cover by Gil Kane and Tom Palmer, with alterations on the Frankenstein Monster by John Romita).  Here, Jack's sister was kidnapped by the Brotherhood of Baal to be a sacrifice, while the Monster was seeking Danton Vayla for help.  Vayla happened to be the leader of the brotherhood, and while Jack was trying to free his sister he turned into the Werewolf, leading to the Werewolf By Night and Frankenstein Monster fighting (eventually leading to her freedom and the death of Danton).