Starring Maya Erskine, Jack Quaid, Beck Bennett, Rosalind Chao, Perrey Reeves, and Ed Begley Jr., the film follows two longtime single friends who agree to be each other's plus one at every wedding they're invited to.

Citing Chuck's two previous failed marriages, Ben suggests his dad take some time to think about his decision.

The pair attend a wedding for one of Ben's family members, and he and Alice nearly drunkenly kiss in the pool after a deep conversation.

In the conversation, Alice learns that Ben has been asked to be his dad's best man, and expresses concern as to why he did not tell her or accept the offer.

After some discussion about marriage not requiring 100% certainty that the relationship will work out, Ben realizes his mistake and shows up to a wedding Alice previously invited him to, finding that she is back with Nate.

In November 2017, it was announced Maya Erskine, Jack Quaid, Ed Begley Jr., Finn Wittrock, Rosalind Chao, Perrey Reeves, Beck Bennett and Jon Bass had joined the cast of the film, with Jeff Chan and Andrew Rhymer directing from a screenplay they wrote.

Ben Stiller, Nicholas Weinstock and Jackie Cohn served as executive producers under their Red Hour Films banner.

The website's critical consensus reads, "Plus One reinvigorates the rom-com with an entertaining outing elevated by well-matched leads and a story that embraces and transcends genre clichés.

[10] Nick Schager of Variety praised Maya Erskine's performance and called the film one "genre fans won’t want to miss".

[13] Peter Bradshaw of The Guardian gave the film 2 out of 5 stars and suggested that "[Plus One needs] bigger laughs and more of the big, ironic comedy that Erskine can clearly deliver".

[14] Wendy Ide of The Observer gave Plus One a 4 out of 5 rating, saying that the film is "a predictable odd-couple romance" which is "given extra zest by the fantastic on-screen chemistry of its leads".