Clash of the Titans (1981)
Perseus and some Joppa soldiers travel to the Underworld to behead Medusa and use her head to petrify the Kraken. Once they arrive at the River Styx, Perseus goes to the edge and calls Charon with a blowing horn. After a short time, Charon comes aboard his boat and Perseus gives him the coin he got from Thallo. Perseus and three soldiers then get on the boat and they are transported by Charon in the Underworld.
Clash of the Titans (2010)
Perseus goes to the Underworld with some Argos soldiers and the Djinn Sheikh Sulieman in order to behead Medusa and use her head against the Kraken. They come at the edge of the River Styx where Sheikh Sulieman throws in the water the coin that Perseus obtained from Zeus, then Charon arrives on his boat pulled by two undeads. The group embarks aboard the boat and Charon carries them to Medusa's lair.