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'MacGyver' Season 4 Episode 10 will finally reveal the identity of Mac's mysterious mother and all her secrets

Ever since he found out that his mom was one of the people behind File 47, Mac's been quite troubled and hopefully, this episode will help him find answers to some of those questions

In hindsight, it's pretty weird. 'MacGyver' is now in its fourth season but we've never really learned anything about the mother of Angus "Mac" MacGyver (Lucas Till).

Sure, we know she died when Mac was young (possibly at the hands of the CIA) and we know that she was the mastermind behind File 47, a catastrophic plan to rest the Earth that her sister Gwendolyn Hayes (Jeri Ryan) is currently trying to implement. But so far, that's been about it... until now.

Episode 10 'Tesla + Bell + Edison + Mac' will see Mac going into a dream state and meeting some of his biggest scientific heroes, as well as his long-lost mother. Even without mommy dearest in the mix, Mac's list of heroes is pretty weird as it includes both Nikola Tesla (John Ales) and Thomas Edison (Tom Thon) who were intense rivals.

Clearly there's going to be plenty of drama in the episode, especially since Mac has begun to question what sort of a person his mom might have been. Ever since he found out that she was one of the people behind File 47, Mac's been quite troubled and hopefully, this episode will help him find answers to some of those questions.

The cast of 'MacGyver' Season 4 includes Lucas Till as Angus "Mac" MacGyver, Tristin Mays as Riley Davis, Justin Hires as Wilt Bozer, Meredith Eaton as Matty Weber, Levy Tran as Desi Nguyen and Henry Ian Cusick as Russ Taylor.

Guest stars appearing in this episode include Scottie Thompson as Ellen, Edloe Blackwell as Karen the Librarian, Ramon De Ocampo as Phillip Lasky, Amber Skye Noyes as Scarlett, John Ales as Nikola Tesla, Mark Boyd as Alexander Graham Bell, and Tom Thon as Thomas Edison as well as Jim E Chandler, Matt Mercurio, Cuyle Carvin, Marsha Thomason, Jessica Webb and Erin Ownbey.

Here's the official synopsis for 'Tesla + Bell + Edison + Mac': "When Mac is put into a dream state to help him recall key evidence found in Nikola Tesla's secret lab that could stop Codex’s deadly plot, he encounters Nikola Tesla, Alexander Graham Bell, Thomas Edison…and his mother."

'MacGyver' Season 4 airs on Fridays at 8 pm ET on CBS.