You Do Need power plug adapter while traveling from Western Sahara to Cayman Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Cayman Islands are A and B and in Western Sahara are C and E. This is how they look like.

Western Sahara

In Western Sahara, outlets of type C and E are in use.

Type C

Type E

Cayman Islands

In Cayman Islands, outlets of type A and B are in use.

Type A

Type B