Sometime later, after all the Crystal Ponies were calmed down and heard that the threat of Sombra's ghost had passed, they were all invited to the castle.
Inside the throne room, Cadence, Celestia, Luna, Spike, and Shining stood around the throne, with multiple ponies both crystal and normal were gathered on two sides. Suddenly the doors opened revealing the girls, the Ghostbusters, and Slimer. Many pony guards played fanfare as the group trotted down the center on the carpet. As they trotted such ponies as Rainbow Dash and Peter were waving their hooves to all the guests, as they were soaking in the attention.
When they reached the throne, Cadence descended from it and spoke to the audience, "Mare's and Gentlecolts, as princess of the Crystal Empire it is with great pleasure that we give thanks to not only my fellow princess Twilight Sparkle and her friends bearing the elements of Harmony, but four out of this world beings who helped save our kingdom from the threat of its former leader. I give you, the Ghostbusters!"
The ponies cheered as the four ghostbusters stood side by side the the princess while waving their hooves, as Cadence continued, "Dr. Peter Venkman, Dr. Ray Stanz, Dr. Egon Spengler, and Winston Zeddemore. We owe your our lives, and cannot thank you enough for what you did."
"It's what being a Ghostbuster is, Princess," Peter answered, "It's a messy job, but somepony's gotta do it."
Cadence chuckled at his humor, "And as a special thanks for your hard work, Shining Armor and I made sure that our empire will always remember you."
"Really, how?" Ray asked.
Cadence led the group to the balcony, and Cadence spoke, while motioning downward, "Behold," The boys gasped seeing statues of the four, including Slimer made out of crystal, "In dedication to the brave and courageous ones who defeated an evil ghost."
"Hey you got my good side." Peter said in joy.
"What an honor." Ray gasped.
"Kind of unnecessary." Egon voiced up.
"Hey, it's obviously their tradition." Winston stated.
"Hello, gorgeous." Slimer said to his statue, while pretending to slick hair back.
Pinkie bounced over, "We hope you're still staying, because tonight we have a special party in honor of you guys."
"A party?" they asked.
"Uh-huh."
"I'm down with that." Peter said.
"Me too." Ray put in.
"Me three!" Slimer agreed.
"Count me in." Winston added, as they looked at Egon who sighed in reluctance.
"I suppose." he answered.
"Yeah!" the three Ghostbusters and Slimer cheered.
That night inside the Crystal Palace's royal hall, the place was loaded with Crystal ponies, and regular ponies who were mingling with the girls, and the ghostbusters. Slimer was flying through the buffet and slid down the long table with his mouth open, devouring everything on the table in a split second. His act caused many of the ponies to look disturbed. Over by the princesses, Peter and Ray were conversing with them, "We're glad you could have this party thrown for us, your excellencies." Ray bowed to them.
"There's nothing we wouldn't do for heroes of Equestria." Luna answered.
"And you all should be very proud." Celestia added.
"Oh believe me, we are proud." Peter answered with a smile.
"And as promised, we've brought your your fee." Celestia added as she levitated a giant bag of bits to them.
"Whoa-ho-ho, Ray, get ready to retire." Peter said in excitement.
"This is so generous of you." Ray gasped at how much they received.
"Think nothing of it." Celestia smiled.
"Oh, when I get home I'm gonna buy me a rad sports car," Peter said ,as he picked up two bits but looked at them seeing pony images on them rather than American presidents, plus they weren't exactly gold either, "Uh, what's this?"
"Why they're bits of course." Luna answered, feeling as if he asked them a dumb question.
Peter and Ray looked nervous as the wisecracked spoke up, "Any way we can convert these into USD?"
"I'm afraid bits are Equestria's currency, that and jewels." Luna explained.
Suddenly Peter and Ray's look of hope was dashed and Peter thought in agony, 'NO! She paid us in play money!'
Celestia noticing Peter and Ray's looks of disappointment, "Is something the matter?"
"Sorry princess, it's just we can't use this back home." Ray explained.
"Oh, I'm so sorry." Celestia apologized, not realizing that they had different types of currency.
Peter swallowing his disappointment, put a smile on, "Hey, it's no big. Here you keep it. You and Luna here treat yourselves to a night out." the two sisters blushed at his offer back.
Egon meanwhile was mingling with two ponies named Bon-Bon and Lyra, as the green unicorn was speaking, "I study anthropology, because I absolutely adore human lifestyle. What about you doctor, have you got any hobbies outside ghost catching?"
"I collect spores, molds, and fungus." Egon admitted.
"Fascinating." Lyra said, as she scooted closer to the unicorn ghostbuster.
"Only you Lyra, would be fascinated so easily." Bon Bon rolled her eyes.
Winston was with Applejack by a buffet table that wasn't consumed by Slimer, yet. He was tasting an apple fritter, that Applejack whipped up for the party, "Man these here apple fritters are tasty, A.J."
"Thanks, Winston. Sure is sad ya have to leave in the morning. Mah family really liked you." Applejack said.
"I could tell, especially your grandma really liked having me around." he said remembering how she poked fun at the two thinking they were an item.
"Yeah, ah know." Applejack laughed with him.
Soon the four Ghostsbusters were with the girls and Spike, as they continued to enjoy the party, "I gotta say this is one swell party." Peter said as he had a drink from a cup.
"And it's not over yet." Pinkie answered.
"What do you mean?" Ray asked.
"Well while preparing for this party I had written up a song about you guys and hired a professional to sing it in your honor." she explained.
"You hired somepony, Pinkie Pie?" Twilight asked in confusion.
"Of course, you're not the only one who has connections." Pinkie answered, before looking to a nearby clock, "Ooh almost time!" she zipped off and appeared on a stage.
"Is this thing on?" she tapped a mic, that emitted feedback causing everypony to pull their ears down, "Good. Good evening everypony!" she announced, "Tonight we have a special performance dedicated to our new friends the Ghostbusters. And to perform this little bit I had planned, give it up for Canterlot's Hay Bucker Jr.!" suddenly a spotlight shined onto the stage revealing a unicorn stallion, who had a brown light brown coat, black mane, tail, a microphone for a cutie mark, and was wearing a black vest.
"Thank you, Ms. Pie," Hay Bucker Jr. began, "When you showed me that song you made up for these guys I knew it sounded like a hit. Now let me personally share with you what her song and my voice can create. Hit it!" he announced as a band started playing eerie upbeat music.
The boys looked each each other as Peter spoke, "Doesn't this sound familiar?"
"Yeah, like we hear it on a daily basis." Ray agreed.
"Can't be, can it?" Winston asked Egon who shrugged.
Hay Bucker Jr. stepped off stage while doing a bit of a dance while singing the song Pinkie made out, with three mares acting as back up singers were announcing the chorus. As the singing colt performed, the whole crowd started dancing along, including the ghostbusters, the girls, Spike, and the princesses.
Luna was rocking her head to the beat as a lyric came to her while Hay was singing, "Busting makes me feel good!" she sang, Celestia looked at her younger sister who shrugged in response, and Celestia chuckled with her.
Hay continued singing as he gathered the four Ghostbusters to join with him in dancing, "Who're ya gonna call?" Hay sang.
"Ghostbusters!" the ponies cheered.
"Who're ya gonna call?" Hay repeated the line, but Peter was lip synching with him.
"Ghostbusters!" The girls and Spike cheered.
"Who're ya gonna call?" Hay sang, but this time Ray was lip synching with him.
"Ghostbusters!" the three princesses called.
"Who can ya call?" Hay continued.
"Ghostbusters!" Pinkie screamed.
Peter got on his back as Hay and Ray helped Peter break dance by spinning him using their magic. The ponies partied hard, until it was time to wrap it up and everyone was sent to bed.
The very next morning, the Ghostbusters and Slimer stood by their car, as the princesses, Shining, the girls, and Spike stood on opposite sides, "Well it looks like it's time for us to go." Ray began.
"Affirmative." Egon agreed.
"We really wish you could stay a bit longer." Twilight said with a bit of sorrow.
"So do we." Winston agreed.
"But a Ghostbuster's job never ends." Peter finished.
"once again we can't thank you enough for what you've done." Cadence thanked them.
"Yes, you are not only heroes of the Crystal Empire, but true friends to all of us." Celestia added.
"Right back at ya." Peter smiled.
"Now when you return you will return to your normal forms, and your car will be as well." Celestia explained.
"So that means it won't be able to fly anymore?" Ray asked in shock, and the princess nodded feeling his disappointment.
"Hey Ray, it wasn't meant to be." Peter nudged his shoulder.
"I suppose." Ray replied.
The six and Spike approached to give their final goodbyes, "We're really gonna miss you guys!" Pinkie cried as she pulled them all in a group hug, making their eyes bulge.
"Can't breathe!" Ray cried, until they were released.
"You guys are some of the coolest guys I ever met. Well not as much as me," Rainbow boasted, "But still cool. You take care."
"You as well, Rainbow Dash," Peter said, as the two flew up and high hoofed, "I'm gonna miss not being able to do this." he admitted as he floated.
"Ya'll are always welcomed in Ponyville, as well as mah farm. Especially you Winston." Applejack stated.
"Thanks, A.J." the two hugged.
Fluttershy was petting Slimer's head as he giggled, "You take care now, Slimer. And try to behave yourself for them."
"I will." Slimer answered as he kissed Fluttershy's cheek making her giggle.
"Thanks for making us these replicated suits for us, Rarity. You really work wonders." Ray thanked the fahsionista.
"It was my absolute pleasure, Dr. Stanz. And if you and your friends are ever in Ponyville again I could make you all some other types of outfits befitting you all." She offered.
"Deal."
Twilight and Egon were last, "Well I guess this is goodbye, Egon."
"Unfortunately." he admitted in regret.
"I did enjoy the time we studied together. I learned quite a lot from you and your friends." Twilight admitted.
"I have learned a lot from you as well. More than just how to use magic." Egon admitted, while motioning to his horn.
"Next time you and your friends come here we should get to know each other better outside catching ghosts." Twilight offered.
"I'd really like that." Egon smiled, until Twilight nuzzled into his neck taking him by surprise. Egon going against his neutral expressions nuzzled her back.
And so the four ghostbusters and Slimer stood by their ride, as Celestia spoke, "Are you all ready?"
"Ready and waiting." Peter answered.
"Then goodbye, Ghostbusters." Luna began.
"May we all one day meet again." Celestia concluded as she used her magic to surround the group with her magic aura. In a flash of light the group and the vehicle vanished into thin air. Twilight and her friends smiled knowing they'll always remember their friends the Ghostbusters.
Meanwhile back in New York at the Ghostbusters HQ, Janine was inside the garage, until a flash of light blinded her. When the light died down she saw the guys, Slimer, and the Ecto-1 with all their equipment inside the vehicle.
"Guys!" she called.
The ghostbusters looked at themselves seeing they were human once again, and were wearing the full jumpsuits and not the ones Rarity made for them, "We're human!" Ray gasped.
"Which means we're home!" Peter cheered.
"It's good to be back." Winston smiled.
"Indeed." Egon agreed.
Janine approached, "So how did the job go?"
"We came, we saw, and kicked it's ghostly pony flank!" Peter declared as he pulled out the trap containing Sombra.
"What's say we unload Sombra into his new home?" Ray suggested.
"Good idea." Egon agreed, as they went for the containment unit. After inserting the trap, they went through the procedures and when the light turned green, the trap was clean.
"Adios Sombra, have fun with your new ghost friends." Peter joked.
"So how much did ya earn for this job?" Janine asked.
"This one was on the house." Egon answered.
"On the house? Venkman would never allow you guys to not accept a fee." Janine said, knowing that wasn't like them.
"This case was an exception." Peter replied, knowing their pay would be useless in New York.
"If you say so." Janine replied.
"I don't know about you guys, but I could go for a few more winks." Winston said.
"Same here," Ray yawned, as his hands went into his suits pockets, before feeling around, "Hey, guys. I got something here in my pocket.
They saw Ray pull something out and looked to see it was a picture taken at the party at the Crystal Empire. It was of the Ghostbusters, the girls, Spike, Slimer, Shining, the princesses, and even Hay Bucker Jr. smiling in the picture, except Peter who was frowning at Slimer who slimed him before the picture was taken.
The guys chuckled seeing that they got a keepsake from their mission in Equestria, "You know something guys, I think we learned a valuable lesson in Equestria."
"I know what ya mean." Winston agreed.
"You bet." Peter put in.
"I concur." Egon nodded.
"Yeah," Slimer nodded, and finished for them, "Friendship is Magic!" the group chuckled.