"sirk" is a character costume in the StrikeForce Kitty series, based on Captain Kirk from the Star Trek franchise.
The first letters of his and Spock's names are swapped.
StrikeForce Kitty
"sirk"
The fox wearing the "sirk" costume can be found in level two with "kpock" before facing Foxbazer. Wearing the set requires defeating the fox multiple times until two pieces are obtained, or by unlocking chests.
The set contains two pieces: uniform and disruptor. "kpock" does 
ranged damage and has a 30% chance to deal double the damage to an enemy.
| Part | Effect | Image |
|---|---|---|
| Head | none | |
| Torso | 11 health | 
|
| Main-hand | 15 strength | 
|
| Off-hand | none |
StrikeForce Kitty 2
"Sirk" in StrikeForce Kitty 2
The fox wearing the "Sirk" costume can be found on level 7 with "Kpock" in the middle of the level near the key. The costume can be obtained by defeating the fox multiple times or using lottery tickets.
The set also contains the same uniform and disruptor carried from StrikeForce Kitty. "Sirk" also does 
ranged damage, but the ability is changed to removing obstacles with an eye icon from the path.
| Part | Effect | Image |
|---|---|---|
| Head | none | |
| Torso | 10 health, 5 strength | |
| Weapon | 5 strength, 10 speed |
StrikeForce Kitty: Last Stand
"sirk" in Last Stand
"sirk" is one of the costumes obtainable by defeating raccoons in StrikeForce Kitty: Last Stand, look in the pages categorized in "Ranged".