Final answer:
The 'American Dad' episode where Roger kills five people over $20 is called 'Ricky Spanish', featured in Season 7.
Step-by-step explanation:
The episode of American Dad where Roger kills five people over $20 is 'Ricky Spanish,' which is the seventeenth episode of Season 7. In this episode, Roger reprises a persona known as Ricky Spanish, the most hated man in Langley Falls, and he tries to make amends for all the wrongs he did under this persona. He ends up betraying Steve at the end of the episode, and as they part ways, Roger tricks a group of people into thinking they owe him $20 each, leading to their deaths.