Leo G. Carroll — Prof. Gerald Deemer — Tarantula!

Tarantula is a 1955 American science-fiction monster film produced by William Alland and directed by Jack Arnold. It stars John Agar, Mara Corday, and Leo G. Carroll. The film is about a scientist developing a miracle nutrient to feed a rapidly growing human population. In its unperfected state, the nutrient causes extraordinarily rapid growth, creating a deadly problem when a tarantula test subje