Colton Dunn (as Garrett - left) with some of the cast of NBC's sitcom "Superstore." The show's third season finale is set for Thursday, May 3 at 8:00 p.m. The show was recently renewed for a fourth season.

As NBC’s hit sitcom “Superstore” – airing Thursdays at 8 p.m. - approaches the end of its third season, several big questions may be answered, according to Colton Dunn. The funnyman plays the apathetic and sarcastic Garrett - an associate at fictional megastore Cloud 9 populated with a gaggle of misfit employees.

As the “Will they/won’t they” romantic tension between Garrett’s coworkers Jonah and Amy (portrayed by Ben Feldman of “Mad Men” and America Ferrera of “Ugly Betty,” respectively) screeches forward toward some sort of resolution, the complication of Jonah’s relationship with new roommate-girlfriend, Kelly (Kelly Stables of “Two and a Half Men”) hangs in the balance.

Further tangling the issue is the fact that Amy believes she might be pregnant, following a one-night stand with her ex-husband.

Speaking of babies and complicated relationships, “Superstore” viewers are about to see assistant manager Dina (played by the hilarious Lauren Ash, a veteran of Second City in Chicago and Toronto) give birth to the baby of store manager Glenn (Mark McKinney of “Kids in the Hall”). Unable to conceive their own child, Glenn and his wife contracted Dina to be their surrogate.

“I would certainly not recommend that anyone have somebody from their workplace carry a baby for them,” Dunn laughed. “One of the funniest things about it is that Glenn and Dina don’t get along at all.

When a new corporate district manager discovered that Cloud 9’s resident octogenarian Myrtle (played by Linda Porter) was the store’s highest-paid employee after 30 years of service, she was promptly let go, but Dunn has some words of comfort for fans of the frequently forgetful character.

“I have a feeling that Myrtle’s coworkers are going to do something about her being let go from Cloud 9,” he said. “They’re going to try to get her back.”

Like “The Office” and “Scrubs,” “Superstore” is a single-camera sitcom without a laugh track. Part of what viewers see each in each episode is delivered as written and part of it is created in the moment by a cast steeped in improv comedy.

“That’s one of the best things about our show,” said Dunn. “A lot of the performers have improv chops. The writers give us great scripts to work with, but we like to play with those scenes. What you see is a great mix of writing and improv inspired by the writing.”

In addition to “Superstore,” Dunn can also be seen in the new film “Blockers,” where three sets of parents try to prevent their daughters from losing their virginity on prom night.

“We were all at the premiere for “Blockers” and I just laughed continuously,” Dunn said. “I play a limo driver and it’s my job to make sure the kids have a wonderful night. John Cena and Leslie Mann are wonderful and Ike Barinholtz is an old friend of mine. They’re all very funny.”

The season three finale for “Superstore” is set for Thursday, May 3, at 8:00 p.m. on NBC.

According to Dunn, NBC’s early order for a 22-episode fourth season of “Superstore” gave the cast an extra boost as they shot the season’s remaining episodes.

“I loved it, Mike,” Dunn said of his network’s vote of confidence. “It’s very nice to leave work and know you’ve got a job to come back to. We’re super excited for season four and I think you’ll see season three wrap up in a very fun way.”