Who is Martin in Fleabag?

The brother-in-law nobody invited, including Claire · Outsiders & In-Laws

Martin (The brother-in-law nobody invited, including Claire) is a character in Fleabag, part of Outsiders & In-Laws. Martin is Claire's American husband: a drinker in remission from nothing, a deliverer of jokes that arrive like spills, and the man whose move on Fleabag at a birthday party becomes the family's buried landmine — because, naturally, Claire believes him. Martin's genius is making himself the reasonable one in every room he poisons. His exit negotiation with Claire ('I'm not a bad guy, I just have a bad personality') is the show handing a small, perfect aria to its least lovable character.

When does Martin first appear?

Martin first appears in Season 1, Episode 1 of Fleabag (2016–2019, BBC/Prime Video).

Who is Martin connected to?

Relationships already established when Martin first appears — nothing from later episodes.

• Claire — The marriage everyone but Claire has left

Which group does Martin belong to?

By the time Martin appears, Outsiders & In-Laws also includes Godmother, The Bank Manager.

Who else is introduced in this episode?

• Fleabag — She'd tell you her name, but she's talking to you instead
• Claire — The sister with the haircut and the schedule
• Dad — The father who can't finish a sentence about feelings
• Godmother — The artist — passive aggression as a medium
• Boo — The best friend the café was for
• The Bank Manager — The loan, declined; the kindness, extended

Watching right now? Open Martin in the interactive map, set the episode you've reached, and see every relationship and bio update you already know — spoiler-free.