The Birth of the Monster Mash
Long before the MCU was a glimmer in Disney's eye, Universal Pictures realized they could sell more tickets by putting two of their biggest stars in the same room. Frankenstein Meets the Wolf Man is essentially the pilot for the shared-universe concept. It picks up right where The Wolf Man (1941) left off, with Larry Talbot being accidentally resurrected and immediately looking for a way to die again.
What makes this work for modern kids—specifically those who are 'recovering' from the high-octane intensity of modern horror—is the scale. The stakes are personal and tragic. Larry Talbot isn't a villain; he's a victim of a curse. Watching him navigate his own morality while searching for the late Dr. Frankenstein provides more emotional weight than your average creature feature.
A Note on the 'Monster'
If your kid is a fan of the classic Frankenstein design, they might find this version a bit odd. This is the only time Bela Lugosi (the original Dracula) played the Monster. Behind the scenes, the Monster was supposed to be blind and speak with Lugosi's voice, but the studio cut those scenes, leaving Lugosi to wander around with his arms out and his mouth shut. It looks weird, but it's a great bit of film trivia to share while watching.
Ultimately, this is a 'vibe' movie. If you want to introduce your kids to the classics, start here. It’s more engaging than the original Frankenstein for a modern attention span because it has the dual-threat of the werewolf transformation and the eventual castle-smashing showdown.