Per 
Item #: SCP-XXXX
Object Class: Keter
Special Containment Procedures:
-SCP-XXXX must be contained in facility C-81 in low orbit over Pluto’s moon of Charon.
-SCP-XXXX is to be held in a circular chamber of a radius no larger than three meters
- The chamber should be furnished with a variety of cat trees, toys, scratching posts, and whatever the hell else cats do
- Facility C-81 should be staffed by D-class personnel at all times, as well as a full complement of security staff and a fully equipped team of gourmet chefs to prepare meals for the cat (cat has preference for traditional Japanese and Korean cuisine)
-SCP-XXXX should not be more than five meters away from food at any given time
-SCP-XXXX food should be replaced no less than six times a day
-SCP-XXXX should be pet by D-Class no less than three times per hour
- In event of containment breach, the cat can usually be calmed down using traditional cat-calming techniques such as catnip, laser pointers, and petting. Extreme cases may require use of strong sedatives.
- Any distressing object or person should be immediately removed from the cat’s vicinity.
Description: SCP-XXXX is a morbidly obese, grey-white cat, weighing an average of approximately twenty (20) kilograms.
SCP-XXXX is capable of changing it's mass and density seemingly indefinitely.
During periods of elation, SCP-XXXX will reduce it's mass and density, resulting in it becoming less dense than air and as such it will float.
During periods of distress, SCP-XXXX will increase it’s mass and density indefinitely until it's stress has been remedied. This includes instances in which the cat wants something, such as attention or food, and may indicate that the cat is not only aware of it's ability to alter it's mass and density, but use this to it's advantage.
Cat’s vlolume stays the same while it's mass and density can increase or decrease.
The cat dislikes remaining in one chamber for long periods of time and is sometimes permitted to roam the facility freely.
Due to the odd spacetime effects of the cat’s mass ability, time can dialate around it. Interestingly, the spacetime dialation of the cat remains present even when the cat is seemingly at non-relativistic masses. On average, time is dialated around the cat such that one minute to an immediate observer is closer to ten minutes from a distant observer.
The cat is very friendly although is subject to the mood changes and skittishness that most cats portray. It seems to be highly intelligent for it's breed. The cat has seemingly developed a very specific pallet for food and will react aggressively if provided with food outside of its pallet or the same food repeatedly. For this reason, the cat should be provided with variation in it’s diet.
The cat is seemingly bulletproof as a result of it's density. Attempts to puncture the cats flesh have been met with sudden shifts in density and thus failure of the puncturing device.
When moving the cat, it is recommended the cat is sedated via either oral or respiratory means.
Invasive testing cannot be performed as the cat is seemingly unable to be performed. Attempts at X-rays or CAT-Scans have been met with similar failures as a result of the cat’s density.
The cat can be coaxed into testing with use of food or catnip.
It can also be sedated and tested on.
The cat is known to ‘defend itself’ in the event of aggressive or distressing action towards it by pinning the aggressor and continuing to increase it's mass and density until either calmed down or the aggressor as been killed.
The cat has no known limitations of the cat’s ability to alter it's density, and thus could theoretically increase in mass until becoming a singularity, and possibly beyond.
The cat was first brought to the attention in 1991 following the collapse of the Soviet Union, upon which place the former Soviet Anomalous Division handed over custody of SCP-XXXX to Foundation officials.
Cold War documents have revealed the cat to be an experimental Soviet biological weapon, the intention thereof being a bomb or precise assassination device designed to infiltrate and destroy a variety of targets. Only one prototype - SCP-XXXX - is known to exist and is in Foundation custody. Further research developments into the project were halted following the collapse of the Soviet Union in 1991. As a result, SCP-XXXX is in personality and appearance, apart from anomalous abilities as described below (probably)
