Michelle has taken the helm in the BBC One drama, which kicked off last week, and the latest instalment saw her character - Lance Corporal Georgie Lane - taken hostage in Kenya, near the border of Somalia.
In dramatic scenes, viewers watched as Georgia was bundled into a van by terrorists and locked up, before a knife was held to her throat.
After watching the second episode, Mark was quick to gush about his wife on social media. He tweeted: "WOW WOW WOW !! #OurGirl unbelievable!!"
Mark then added: "This one @michkeegan astounds me more every day....Truly sensational performance!!"
Meanwhile, Mark is by no means the only famous fan of Our Girl. Before the episode aired, singer Olly Murs tweeted: "Excited to see @michkeegan on #ourgirl @bbcone right now!! @MarkWright_ tells me tonight's is better than last week..."
Olympic swimmer and former I'm A Celebrity...Get Me Out Of Here! contestant Rebecca Adlington added: "Yes! #GBBO followed by #OurGirl !!!! Best night!"
And Made In Chelsea's Lucy Watson said: "Wow @michkeegan is absolutely killing it in #OurGirl."
EastEnders actress Lacey Turner played the original lead in Our Girl, 18-year-old Molly Dawes, before leaving after one series.
Our Girl continues at 9pm on Wednesday 21 September