Basil Rathbone tries to hide the cake from Boris Karloff to surprise him for his birthday on the set of "Son of Frankenstein". ...

Jack Pierce works on Bela Lugosi's beard for his role as Ygor in "Son of Frankenstein".

Master Make-up Man Jack Pierce works on Boris Karloff for "Son of Frankenstein".

Boris Karloff from "Son of Frankenstein" appears on this wax packaging for Creature Feature Trading Cards.

The lighting is wonderful in this painting of Boris Karloff as he appeared in "Son of Frankenstein". By Sanjulian.

They're all celebrating Boris Karloff's birthday on the set of "Son of Frankenstein"!

Yet another incredible piece by Daniel Horne.

Boris Karloff gets his final touches for "Son of Frankenstein".

Bela Lugosi, Jr. visits his father on the set of "Son of Frankenstein".

Boris Karloff in the finale of "Son of Frankenstein".

Jack Pierce works on Bela Lugosi from "Son of Frankenstein".

Jack Pierce in the beginning phases of turning Bela Lugosi into Ygor from "Son of Frankenstein".

Boris Karloff in a behind the scenes shot from "Son of Frankenstein".

Here's a nice closeup of Bela Lugosi as Ygor from "Son of Frankenstein".

Boris Karloff takes a break on the set of "Son of Frankenstein".

Bela Lugosi as Ygor from "Son of Frankenstein".

The Monster eats his lunch, which was kindly brought to him by Dr. Frankenstein's assistant, seen here at the bottom of the steps. A ...

From "Son of Frankenstein".

Bela Lugosi as Ygor explains how his broken neck causes him to cough uncontrollably. From "Son of Frankenstein".