1. R-36 ICBM
Topping the list is the Russian R-36, which like the Trident is a nuclear armed ballistic missile with intercontinental range.
Unlike the Trident, the R-36 is a landbased missile, which takes away some of the terrifying factor.
The missile was equipped with a few different warheads. When it was originally deployed it came with a single 18 megaton (mk1) or 25 megaton warhead.