Rub the bottle, and the djinni will come out. Not guaranteed to look like Barbara Eden. One can turn into a mass of smoke, and has special abilities in that form.
Attribute Modifiers: ST+10 ; DX+4 ; IQ+1 [+20]; HT+4 .
Secondary Characteristic Modifiers: Per+3 .
Advantages: Alternate Form (Outward form of another creature of the same point value or less) ; Damage Resistance 3 ; Doesn’t Breathe (Only while using Insubstantiality, -10%) ; Doesn’t Eat or Drink (Only while using Insubstantiality, -10%) ; Flight (Lighter Than Air, -10%; Only while using Insubstantiality, -10%) ; Injury Tolerance (Damage Reduction 2; Accessibility, Only while using Insubstantiality, -10%; Limited, heat/fire, -40%);  Insubstantiality (Can Carry Objects, Medium, +20%) ; Magery 2 ; Night Vision 9 ; Teeth (Sharp) .
Converted from GURPS Arabian Nights, p. 50.
Djinn can buy more Alternate Forms. Mightier ones also exist.