Frank Kostic

"My god! Are you insane?! (Alan: "He was throwing at eggs at me! He was hurting me!") So, for that, you tried to kill him?! (Alan: "LET ME GO, YOU BIG PUSSY!") You don't tell me what to do!" (Alan: "LET ME GO! YOU ALL SUCK, I HOPE YOU DIE!")

- Frank seeing Alan trying to kill Mickey with a knife, grabbing him by the shirt and argues with him until Alan manages to free himself and runs out of the kitchen in a fury, expressing his hatred toward everyone who picked on him and wishing them all dead

"Michael, go get your brother right now and bring him to Ronnie's shack, on the double. (Michael: "Hey, he's only my step--") I don't give a damn what he is! Just do it! (Michael: "Yes, sir.") (to Sheriff Jerry) You see what I have to put up with here? Do you think these kids would appreciate how hard we worked at for a nice summer? Goddamn kids!"

- Frank telling Michael to fetch his stepbrother Alan after he walked out of the kitchen, interrupting the latter when he tried to correct him and explaining to Sheriff Jerry the problems he keeps having with campers at Camp Manabe, who don't appreciate anything

"You kids have no respect for anything!" (Sherrif Jerry (Angela): "It's alright, Frank. I'll take it from here.")

- Frank when the campers don't listen to him during dinner

"These kids appreciate nothing!"

- Frank complaining about the campers

"I love you so much! I love you so much!  I love you so much!"

- Frank talking to his prized parakeet, Matilda, ending each sentence with a kiss on her head.

"You little punk, what did you do to Matilda?! (Alan: "What are you talking about?") You corrupted my bird Matilda! (Alan: "I DIDN’T DO NOTHING TO YOUR FUCKING BIRD!") (Bella: "Don't lie, Alan. You just told us all about it.") (Alan: "FAT FUCKING LIAR!") You watch that mouth of yours! (Alan: "LET GO OF ME!") I'll let go of you. I'm gonna kick your ass out of this camp so fast you won't know what hit you! (Alan: "LET GO, YOU FUCKING DICK!" (runs almost out of the rec. hall)) You get back here!" (Alan: YOUR ASS STINKS!")

- Frank accusing Alan of corrupting his prized parakeet Matilda which said “Your ass stinks.” (which is Alan’s catchphrase) and threatening to kick him out of Camp Manabe while grabbing him by the shirt until Alan pushes his arms, causing him to release him

"I told you to watch your mouth! (slaps Alan in the face) (Alan: "GET AWAY FROM ME!" (pushes Frank out of the way and runs out of the cabin)) Little bastard!"

- Frank when everyone was bothering Alan chanting "Blowjob", which irritates him and runs out of the cabin after Frank slaps him in the face for cursing.

"You kids better stop that noise and return to your bunks! I'm telling you, for the last time! Stop that noise immediately!"

- Frank telling the campers to stop chanting "Blowjob", causing Alan to be irritated

"All right, that's it! You're all confined to your bunks for the rest of the week!"

- Frank grounding the campers for the rest of the week for chanting "Blowjob", which irritates Alan

"That damn light's killing me. (sees his bird cage on him and realizes he's strapped to a chair) Get me outta this thing! What is this, a joke? Untie me! Get this... (sees Angela picking up a bag full of rats) What are you doing? What the hell's goin' here?! Ah, my neck! Aah! Get me outta this! What the hell's goin' on?! (Angela gets closer to him with the bag) Keep it away. No." (Angela puts 2 rats into his cage, prompting them to eat their way through his left eye and his intestines hence the gaping hole in his stomach)

- Frank's last words before Angela had him eaten by rats, killing him

Frank Kostic is the secondary antagonist in Return to Sleepaway Camp. He was the greedy, shady, and ineffective owner of Camp Manabe during a mysterious murder spree. He tried to keep order but was murdered by Angela Baker. He is Angela Baker's 4th victim.

Background
Frank partnered with Ronnie Angelo to run Camp Manabe in May of 1995. He ran the camp as a money-maker and gave Ronnie little say in the daily operations. At some point he became the owner of Matilda, a prized parakeet.

Return to Sleepaway Camp (2008)
He serves as the secondary antagonist of the film. All he ever did was scold Alan whenever he got into trouble, yell at the campers for not showing him enough respect, and focusing on his prized parakeet, Matilda. He also did nothing to stop the older campers from bullying Alan.

He would be the first to die on the night of the big reveal of the murderer. After a conversation with Ronnie, he went to use the bathroom when said killer opened Matilda's birdcage and gently let Matilda out using her finger. Frank heard his parakeet squawking and stepped out of the bathroom to see what was the matter, only to get knocked unconscious with a hammer. He later awoke to find himself bound to a chair with duct tape when the killer placed Matilda's cage over his head, set a lock on the side where it had been split in half and opened its door. As Frank demanded to be untied, he noticed the killer was holding a sack with something alive writhing around in it. At that moment, the cage started cutting through his neck causing it to bleed. The killer slapped the sack purposely agitating whatever was inside, dumped its contents (which happened to be two rats) into the cage, and shut the door. The rest is implied off screen.

Ronnie and Jenny found an unharmed Matilda perched outside and saying “Your ass stinks.”, and entered the cabin to find her owner half devoured as the rats had eaten their way through his left eye down to his intestines hence the gaping hole in his stomach.

Behind the Scenes
The opening sequence includes a newspaper article giving Frank the surname 'Kostic,' perhaps meaning that he is Mel Kostic's son.

Trivia

 * At one point, Alan calls Frank "Big pussy!" which is a reference to The Sopranos since Frank's actor Vincent Pastore plays a character called Big Pussy.